diff --git a/BUILD b/BUILD
index fc4dfe8d9acc25adae764c0daef3c52062cace77..32ff4b4d9a86747c360aa1a8cfe0b03d07657dfb 100644
--- a/BUILD
+++ b/BUILD
@@ -159,6 +159,8 @@ cc_library(
 cc_library(
   name = "grpc",
   srcs = [
+    "src/core/ext/lb_policy/grpclb/load_balancer_api.h",
+    "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h",
     "src/core/ext/transport/chttp2/transport/alpn.h",
     "src/core/ext/transport/chttp2/transport/bin_encoder.h",
     "src/core/ext/transport/chttp2/transport/chttp2_transport.h",
@@ -198,9 +200,6 @@ cc_library(
     "src/core/lib/client_config/client_config.h",
     "src/core/lib/client_config/connector.h",
     "src/core/lib/client_config/initial_connect_string.h",
-    "src/core/lib/client_config/lb_policies/load_balancer_api.h",
-    "src/core/lib/client_config/lb_policies/pick_first.h",
-    "src/core/lib/client_config/lb_policies/round_robin.h",
     "src/core/lib/client_config/lb_policy.h",
     "src/core/lib/client_config/lb_policy_factory.h",
     "src/core/lib/client_config/lb_policy_registry.h",
@@ -260,7 +259,6 @@ cc_library(
     "src/core/lib/json/json_common.h",
     "src/core/lib/json/json_reader.h",
     "src/core/lib/json/json_writer.h",
-    "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h",
     "src/core/lib/security/auth_filters.h",
     "src/core/lib/security/b64.h",
     "src/core/lib/security/credentials.h",
@@ -296,6 +294,10 @@ cc_library(
     "src/core/lib/tsi/ssl_types.h",
     "src/core/lib/tsi/transport_security.h",
     "src/core/lib/tsi/transport_security_interface.h",
+    "src/core/ext/lb_policy/grpclb/load_balancer_api.c",
+    "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c",
+    "src/core/ext/lb_policy/pick_first/pick_first.c",
+    "src/core/ext/lb_policy/round_robin/round_robin.c",
     "src/core/ext/transport/chttp2/client/insecure/channel_create.c",
     "src/core/ext/transport/chttp2/client/secure/secure_channel_create.c",
     "src/core/ext/transport/chttp2/server/insecure/server_chttp2.c",
@@ -343,9 +345,6 @@ cc_library(
     "src/core/lib/client_config/connector.c",
     "src/core/lib/client_config/default_initial_connect_string.c",
     "src/core/lib/client_config/initial_connect_string.c",
-    "src/core/lib/client_config/lb_policies/load_balancer_api.c",
-    "src/core/lib/client_config/lb_policies/pick_first.c",
-    "src/core/lib/client_config/lb_policies/round_robin.c",
     "src/core/lib/client_config/lb_policy.c",
     "src/core/lib/client_config/lb_policy_factory.c",
     "src/core/lib/client_config/lb_policy_registry.c",
@@ -411,7 +410,6 @@ cc_library(
     "src/core/lib/json/json_reader.c",
     "src/core/lib/json/json_string.c",
     "src/core/lib/json/json_writer.c",
-    "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c",
     "src/core/lib/security/b64.c",
     "src/core/lib/security/client_auth_filter.c",
     "src/core/lib/security/credentials.c",
@@ -457,6 +455,7 @@ cc_library(
     "src/core/lib/tsi/fake_transport_security.c",
     "src/core/lib/tsi/ssl_transport_security.c",
     "src/core/lib/tsi/transport_security.c",
+    "src/core/plugin_registry/grpc_plugin_registry.c",
   ],
   hdrs = [
     "include/grpc/byte_buffer.h",
@@ -530,6 +529,8 @@ cc_library(
 cc_library(
   name = "grpc_unsecure",
   srcs = [
+    "src/core/ext/lb_policy/grpclb/load_balancer_api.h",
+    "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h",
     "src/core/ext/transport/chttp2/transport/alpn.h",
     "src/core/ext/transport/chttp2/transport/bin_encoder.h",
     "src/core/ext/transport/chttp2/transport/chttp2_transport.h",
@@ -569,9 +570,6 @@ cc_library(
     "src/core/lib/client_config/client_config.h",
     "src/core/lib/client_config/connector.h",
     "src/core/lib/client_config/initial_connect_string.h",
-    "src/core/lib/client_config/lb_policies/load_balancer_api.h",
-    "src/core/lib/client_config/lb_policies/pick_first.h",
-    "src/core/lib/client_config/lb_policies/round_robin.h",
     "src/core/lib/client_config/lb_policy.h",
     "src/core/lib/client_config/lb_policy_factory.h",
     "src/core/lib/client_config/lb_policy_registry.h",
@@ -631,7 +629,6 @@ cc_library(
     "src/core/lib/json/json_common.h",
     "src/core/lib/json/json_reader.h",
     "src/core/lib/json/json_writer.h",
-    "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h",
     "src/core/lib/statistics/census_interface.h",
     "src/core/lib/statistics/census_rpc_stats.h",
     "src/core/lib/surface/api_trace.h",
@@ -653,6 +650,10 @@ cc_library(
     "src/core/lib/transport/static_metadata.h",
     "src/core/lib/transport/transport.h",
     "src/core/lib/transport/transport_impl.h",
+    "src/core/ext/lb_policy/grpclb/load_balancer_api.c",
+    "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c",
+    "src/core/ext/lb_policy/pick_first/pick_first.c",
+    "src/core/ext/lb_policy/round_robin/round_robin.c",
     "src/core/ext/transport/chttp2/client/insecure/channel_create.c",
     "src/core/ext/transport/chttp2/server/insecure/server_chttp2.c",
     "src/core/ext/transport/chttp2/transport/alpn.c",
@@ -698,9 +699,6 @@ cc_library(
     "src/core/lib/client_config/connector.c",
     "src/core/lib/client_config/default_initial_connect_string.c",
     "src/core/lib/client_config/initial_connect_string.c",
-    "src/core/lib/client_config/lb_policies/load_balancer_api.c",
-    "src/core/lib/client_config/lb_policies/pick_first.c",
-    "src/core/lib/client_config/lb_policies/round_robin.c",
     "src/core/lib/client_config/lb_policy.c",
     "src/core/lib/client_config/lb_policy_factory.c",
     "src/core/lib/client_config/lb_policy_registry.c",
@@ -765,7 +763,6 @@ cc_library(
     "src/core/lib/json/json_reader.c",
     "src/core/lib/json/json_string.c",
     "src/core/lib/json/json_writer.c",
-    "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c",
     "src/core/lib/surface/alarm.c",
     "src/core/lib/surface/api_trace.c",
     "src/core/lib/surface/byte_buffer.c",
@@ -794,6 +791,7 @@ cc_library(
     "src/core/lib/transport/static_metadata.c",
     "src/core/lib/transport/transport.c",
     "src/core/lib/transport/transport_op_string.c",
+    "src/core/plugin_registry/grpc_unsecure_plugin_registry.c",
   ],
   hdrs = [
     "include/grpc/byte_buffer.h",
@@ -1361,6 +1359,10 @@ objc_library(
 objc_library(
   name = "grpc_objc",
   srcs = [
+    "src/core/ext/lb_policy/grpclb/load_balancer_api.c",
+    "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c",
+    "src/core/ext/lb_policy/pick_first/pick_first.c",
+    "src/core/ext/lb_policy/round_robin/round_robin.c",
     "src/core/ext/transport/chttp2/client/insecure/channel_create.c",
     "src/core/ext/transport/chttp2/client/secure/secure_channel_create.c",
     "src/core/ext/transport/chttp2/server/insecure/server_chttp2.c",
@@ -1408,9 +1410,6 @@ objc_library(
     "src/core/lib/client_config/connector.c",
     "src/core/lib/client_config/default_initial_connect_string.c",
     "src/core/lib/client_config/initial_connect_string.c",
-    "src/core/lib/client_config/lb_policies/load_balancer_api.c",
-    "src/core/lib/client_config/lb_policies/pick_first.c",
-    "src/core/lib/client_config/lb_policies/round_robin.c",
     "src/core/lib/client_config/lb_policy.c",
     "src/core/lib/client_config/lb_policy_factory.c",
     "src/core/lib/client_config/lb_policy_registry.c",
@@ -1476,7 +1475,6 @@ objc_library(
     "src/core/lib/json/json_reader.c",
     "src/core/lib/json/json_string.c",
     "src/core/lib/json/json_writer.c",
-    "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c",
     "src/core/lib/security/b64.c",
     "src/core/lib/security/client_auth_filter.c",
     "src/core/lib/security/credentials.c",
@@ -1522,6 +1520,7 @@ objc_library(
     "src/core/lib/tsi/fake_transport_security.c",
     "src/core/lib/tsi/ssl_transport_security.c",
     "src/core/lib/tsi/transport_security.c",
+    "src/core/plugin_registry/grpc_plugin_registry.c",
   ],
   hdrs = [
     "include/grpc/byte_buffer.h",
@@ -1537,6 +1536,8 @@ objc_library(
     "include/grpc/impl/codegen/propagation_bits.h",
     "include/grpc/impl/codegen/status.h",
     "include/grpc/status.h",
+    "src/core/ext/lb_policy/grpclb/load_balancer_api.h",
+    "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h",
     "src/core/ext/transport/chttp2/transport/alpn.h",
     "src/core/ext/transport/chttp2/transport/bin_encoder.h",
     "src/core/ext/transport/chttp2/transport/chttp2_transport.h",
@@ -1576,9 +1577,6 @@ objc_library(
     "src/core/lib/client_config/client_config.h",
     "src/core/lib/client_config/connector.h",
     "src/core/lib/client_config/initial_connect_string.h",
-    "src/core/lib/client_config/lb_policies/load_balancer_api.h",
-    "src/core/lib/client_config/lb_policies/pick_first.h",
-    "src/core/lib/client_config/lb_policies/round_robin.h",
     "src/core/lib/client_config/lb_policy.h",
     "src/core/lib/client_config/lb_policy_factory.h",
     "src/core/lib/client_config/lb_policy_registry.h",
@@ -1638,7 +1636,6 @@ objc_library(
     "src/core/lib/json/json_common.h",
     "src/core/lib/json/json_reader.h",
     "src/core/lib/json/json_writer.h",
-    "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h",
     "src/core/lib/security/auth_filters.h",
     "src/core/lib/security/b64.h",
     "src/core/lib/security/credentials.h",
diff --git a/Makefile b/Makefile
index 2286abe6259f6a0be48dcee5de4b848a9ca5bc2a..ad18134a3e2bb7634be7bd4899c0db1167800352 100644
--- a/Makefile
+++ b/Makefile
@@ -944,6 +944,9 @@ httpcli_format_request_test: $(BINDIR)/$(CONFIG)/httpcli_format_request_test
 httpcli_test: $(BINDIR)/$(CONFIG)/httpcli_test
 httpscli_test: $(BINDIR)/$(CONFIG)/httpscli_test
 init_test: $(BINDIR)/$(CONFIG)/init_test
+internal_api_canary_iomgr_test: $(BINDIR)/$(CONFIG)/internal_api_canary_iomgr_test
+internal_api_canary_support_test: $(BINDIR)/$(CONFIG)/internal_api_canary_support_test
+internal_api_canary_transport_test: $(BINDIR)/$(CONFIG)/internal_api_canary_transport_test
 invalid_call_argument_test: $(BINDIR)/$(CONFIG)/invalid_call_argument_test
 json_fuzzer_test: $(BINDIR)/$(CONFIG)/json_fuzzer_test
 json_rewrite: $(BINDIR)/$(CONFIG)/json_rewrite
@@ -1255,6 +1258,9 @@ buildtests_c: privatelibs_c \
   $(BINDIR)/$(CONFIG)/httpcli_test \
   $(BINDIR)/$(CONFIG)/httpscli_test \
   $(BINDIR)/$(CONFIG)/init_test \
+  $(BINDIR)/$(CONFIG)/internal_api_canary_iomgr_test \
+  $(BINDIR)/$(CONFIG)/internal_api_canary_support_test \
+  $(BINDIR)/$(CONFIG)/internal_api_canary_transport_test \
   $(BINDIR)/$(CONFIG)/invalid_call_argument_test \
   $(BINDIR)/$(CONFIG)/json_rewrite \
   $(BINDIR)/$(CONFIG)/json_rewrite_test \
@@ -2434,6 +2440,10 @@ endif
 
 
 LIBGRPC_SRC = \
+    src/core/ext/lb_policy/grpclb/load_balancer_api.c \
+    src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c \
+    src/core/ext/lb_policy/pick_first/pick_first.c \
+    src/core/ext/lb_policy/round_robin/round_robin.c \
     src/core/ext/transport/chttp2/client/insecure/channel_create.c \
     src/core/ext/transport/chttp2/client/secure/secure_channel_create.c \
     src/core/ext/transport/chttp2/server/insecure/server_chttp2.c \
@@ -2481,9 +2491,6 @@ LIBGRPC_SRC = \
     src/core/lib/client_config/connector.c \
     src/core/lib/client_config/default_initial_connect_string.c \
     src/core/lib/client_config/initial_connect_string.c \
-    src/core/lib/client_config/lb_policies/load_balancer_api.c \
-    src/core/lib/client_config/lb_policies/pick_first.c \
-    src/core/lib/client_config/lb_policies/round_robin.c \
     src/core/lib/client_config/lb_policy.c \
     src/core/lib/client_config/lb_policy_factory.c \
     src/core/lib/client_config/lb_policy_registry.c \
@@ -2549,7 +2556,6 @@ LIBGRPC_SRC = \
     src/core/lib/json/json_reader.c \
     src/core/lib/json/json_string.c \
     src/core/lib/json/json_writer.c \
-    src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c \
     src/core/lib/security/b64.c \
     src/core/lib/security/client_auth_filter.c \
     src/core/lib/security/credentials.c \
@@ -2595,6 +2601,7 @@ LIBGRPC_SRC = \
     src/core/lib/tsi/fake_transport_security.c \
     src/core/lib/tsi/ssl_transport_security.c \
     src/core/lib/tsi/transport_security.c \
+    src/core/plugin_registry/grpc_plugin_registry.c \
     third_party/nanopb/pb_common.c \
     third_party/nanopb/pb_decode.c \
     third_party/nanopb/pb_encode.c \
@@ -2795,6 +2802,10 @@ endif
 
 
 LIBGRPC_UNSECURE_SRC = \
+    src/core/ext/lb_policy/grpclb/load_balancer_api.c \
+    src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c \
+    src/core/ext/lb_policy/pick_first/pick_first.c \
+    src/core/ext/lb_policy/round_robin/round_robin.c \
     src/core/ext/transport/chttp2/client/insecure/channel_create.c \
     src/core/ext/transport/chttp2/server/insecure/server_chttp2.c \
     src/core/ext/transport/chttp2/transport/alpn.c \
@@ -2840,9 +2851,6 @@ LIBGRPC_UNSECURE_SRC = \
     src/core/lib/client_config/connector.c \
     src/core/lib/client_config/default_initial_connect_string.c \
     src/core/lib/client_config/initial_connect_string.c \
-    src/core/lib/client_config/lb_policies/load_balancer_api.c \
-    src/core/lib/client_config/lb_policies/pick_first.c \
-    src/core/lib/client_config/lb_policies/round_robin.c \
     src/core/lib/client_config/lb_policy.c \
     src/core/lib/client_config/lb_policy_factory.c \
     src/core/lib/client_config/lb_policy_registry.c \
@@ -2907,7 +2915,6 @@ LIBGRPC_UNSECURE_SRC = \
     src/core/lib/json/json_reader.c \
     src/core/lib/json/json_string.c \
     src/core/lib/json/json_writer.c \
-    src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c \
     src/core/lib/surface/alarm.c \
     src/core/lib/surface/api_trace.c \
     src/core/lib/surface/byte_buffer.c \
@@ -2936,6 +2943,7 @@ LIBGRPC_UNSECURE_SRC = \
     src/core/lib/transport/static_metadata.c \
     src/core/lib/transport/transport.c \
     src/core/lib/transport/transport_op_string.c \
+    src/core/plugin_registry/grpc_unsecure_plugin_registry.c \
     third_party/nanopb/pb_common.c \
     third_party/nanopb/pb_decode.c \
     third_party/nanopb/pb_encode.c \
@@ -5824,6 +5832,7 @@ LIBEND2END_TESTS_SRC = \
     test/core/end2end/tests/graceful_server_shutdown.c \
     test/core/end2end/tests/high_initial_seqno.c \
     test/core/end2end/tests/hpack_size.c \
+    test/core/end2end/tests/idempotent_request.c \
     test/core/end2end/tests/invoke_large_request.c \
     test/core/end2end/tests/large_metadata.c \
     test/core/end2end/tests/max_concurrent_streams.c \
@@ -5898,6 +5907,7 @@ LIBEND2END_NOSEC_TESTS_SRC = \
     test/core/end2end/tests/graceful_server_shutdown.c \
     test/core/end2end/tests/high_initial_seqno.c \
     test/core/end2end/tests/hpack_size.c \
+    test/core/end2end/tests/idempotent_request.c \
     test/core/end2end/tests/invoke_large_request.c \
     test/core/end2end/tests/large_metadata.c \
     test/core/end2end/tests/max_concurrent_streams.c \
@@ -8088,6 +8098,102 @@ endif
 endif
 
 
+INTERNAL_API_CANARY_IOMGR_TEST_SRC = \
+    test/core/internal_api_canaries/iomgr.c \
+
+INTERNAL_API_CANARY_IOMGR_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(INTERNAL_API_CANARY_IOMGR_TEST_SRC))))
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL.
+
+$(BINDIR)/$(CONFIG)/internal_api_canary_iomgr_test: openssl_dep_error
+
+else
+
+
+
+$(BINDIR)/$(CONFIG)/internal_api_canary_iomgr_test: $(INTERNAL_API_CANARY_IOMGR_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LD) $(LDFLAGS) $(INTERNAL_API_CANARY_IOMGR_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/internal_api_canary_iomgr_test
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/internal_api_canaries/iomgr.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_internal_api_canary_iomgr_test: $(INTERNAL_API_CANARY_IOMGR_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(INTERNAL_API_CANARY_IOMGR_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
+INTERNAL_API_CANARY_SUPPORT_TEST_SRC = \
+    test/core/internal_api_canaries/iomgr.c \
+
+INTERNAL_API_CANARY_SUPPORT_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(INTERNAL_API_CANARY_SUPPORT_TEST_SRC))))
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL.
+
+$(BINDIR)/$(CONFIG)/internal_api_canary_support_test: openssl_dep_error
+
+else
+
+
+
+$(BINDIR)/$(CONFIG)/internal_api_canary_support_test: $(INTERNAL_API_CANARY_SUPPORT_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LD) $(LDFLAGS) $(INTERNAL_API_CANARY_SUPPORT_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/internal_api_canary_support_test
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/internal_api_canaries/iomgr.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_internal_api_canary_support_test: $(INTERNAL_API_CANARY_SUPPORT_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(INTERNAL_API_CANARY_SUPPORT_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
+INTERNAL_API_CANARY_TRANSPORT_TEST_SRC = \
+    test/core/internal_api_canaries/iomgr.c \
+
+INTERNAL_API_CANARY_TRANSPORT_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(INTERNAL_API_CANARY_TRANSPORT_TEST_SRC))))
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL.
+
+$(BINDIR)/$(CONFIG)/internal_api_canary_transport_test: openssl_dep_error
+
+else
+
+
+
+$(BINDIR)/$(CONFIG)/internal_api_canary_transport_test: $(INTERNAL_API_CANARY_TRANSPORT_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LD) $(LDFLAGS) $(INTERNAL_API_CANARY_TRANSPORT_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/internal_api_canary_transport_test
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/internal_api_canaries/iomgr.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_internal_api_canary_transport_test: $(INTERNAL_API_CANARY_TRANSPORT_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(INTERNAL_API_CANARY_TRANSPORT_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
 INVALID_CALL_ARGUMENT_TEST_SRC = \
     test/core/end2end/invalid_call_argument_test.c \
 
@@ -13634,6 +13740,7 @@ src/core/lib/surface/init_secure.c: $(OPENSSL_DEP)
 src/core/lib/tsi/fake_transport_security.c: $(OPENSSL_DEP)
 src/core/lib/tsi/ssl_transport_security.c: $(OPENSSL_DEP)
 src/core/lib/tsi/transport_security.c: $(OPENSSL_DEP)
+src/core/plugin_registry/grpc_plugin_registry.c: $(OPENSSL_DEP)
 src/cpp/client/secure_credentials.cc: $(OPENSSL_DEP)
 src/cpp/common/auth_property_iterator.cc: $(OPENSSL_DEP)
 src/cpp/common/secure_auth_context.cc: $(OPENSSL_DEP)
diff --git a/PYTHON-MANIFEST.in b/PYTHON-MANIFEST.in
index 25aba87c187d22c3f7ff10b434339ecc6d84c6f2..534f4c1251a47de23fb37017a563e9b4060b35fb 100644
--- a/PYTHON-MANIFEST.in
+++ b/PYTHON-MANIFEST.in
@@ -2,8 +2,10 @@ recursive-include src/python/grpcio/grpc *.c *.h *.py *.pyx *.pxd *.pxi *.python
 recursive-exclude src/python/grpcio/grpc/_cython *.so *.pyd
 graft src/python/grpcio/tests
 graft src/core
+graft src/boringssl
 graft include/grpc
 graft third_party/boringssl
+graft third_party/nanopb
 graft third_party/zlib
 include src/python/grpcio/commands.py
 include src/python/grpcio/grpc_version.py
diff --git a/binding.gyp b/binding.gyp
index a1cdf2ec3669317e6f3d89077392a4b767d4bd11..bfae59e50ce05c24158d6c35b15a5a334201e7db 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -558,6 +558,10 @@
         'gpr',
       ],
       'sources': [
+        'src/core/ext/lb_policy/grpclb/load_balancer_api.c',
+        'src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c',
+        'src/core/ext/lb_policy/pick_first/pick_first.c',
+        'src/core/ext/lb_policy/round_robin/round_robin.c',
         'src/core/ext/transport/chttp2/client/insecure/channel_create.c',
         'src/core/ext/transport/chttp2/client/secure/secure_channel_create.c',
         'src/core/ext/transport/chttp2/server/insecure/server_chttp2.c',
@@ -605,9 +609,6 @@
         'src/core/lib/client_config/connector.c',
         'src/core/lib/client_config/default_initial_connect_string.c',
         'src/core/lib/client_config/initial_connect_string.c',
-        'src/core/lib/client_config/lb_policies/load_balancer_api.c',
-        'src/core/lib/client_config/lb_policies/pick_first.c',
-        'src/core/lib/client_config/lb_policies/round_robin.c',
         'src/core/lib/client_config/lb_policy.c',
         'src/core/lib/client_config/lb_policy_factory.c',
         'src/core/lib/client_config/lb_policy_registry.c',
@@ -673,7 +674,6 @@
         'src/core/lib/json/json_reader.c',
         'src/core/lib/json/json_string.c',
         'src/core/lib/json/json_writer.c',
-        'src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c',
         'src/core/lib/security/b64.c',
         'src/core/lib/security/client_auth_filter.c',
         'src/core/lib/security/credentials.c',
@@ -719,6 +719,7 @@
         'src/core/lib/tsi/fake_transport_security.c',
         'src/core/lib/tsi/ssl_transport_security.c',
         'src/core/lib/tsi/transport_security.c',
+        'src/core/plugin_registry/grpc_plugin_registry.c',
         'third_party/nanopb/pb_common.c',
         'third_party/nanopb/pb_decode.c',
         'third_party/nanopb/pb_encode.c',
diff --git a/build.yaml b/build.yaml
index 43d3c680b8d140c160b252ec974302a4522e109d..c5f2ff5d45462584e715a7d36151008c5320094e 100644
--- a/build.yaml
+++ b/build.yaml
@@ -262,9 +262,6 @@ filegroups:
   - src/core/lib/client_config/client_config.h
   - src/core/lib/client_config/connector.h
   - src/core/lib/client_config/initial_connect_string.h
-  - src/core/lib/client_config/lb_policies/load_balancer_api.h
-  - src/core/lib/client_config/lb_policies/pick_first.h
-  - src/core/lib/client_config/lb_policies/round_robin.h
   - src/core/lib/client_config/lb_policy.h
   - src/core/lib/client_config/lb_policy_factory.h
   - src/core/lib/client_config/lb_policy_registry.h
@@ -324,7 +321,6 @@ filegroups:
   - src/core/lib/json/json_common.h
   - src/core/lib/json/json_reader.h
   - src/core/lib/json/json_writer.h
-  - src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h
   - src/core/lib/statistics/census_interface.h
   - src/core/lib/statistics/census_rpc_stats.h
   - src/core/lib/surface/api_trace.h
@@ -363,9 +359,6 @@ filegroups:
   - src/core/lib/client_config/connector.c
   - src/core/lib/client_config/default_initial_connect_string.c
   - src/core/lib/client_config/initial_connect_string.c
-  - src/core/lib/client_config/lb_policies/load_balancer_api.c
-  - src/core/lib/client_config/lb_policies/pick_first.c
-  - src/core/lib/client_config/lb_policies/round_robin.c
   - src/core/lib/client_config/lb_policy.c
   - src/core/lib/client_config/lb_policy_factory.c
   - src/core/lib/client_config/lb_policy_registry.c
@@ -430,7 +423,6 @@ filegroups:
   - src/core/lib/json/json_reader.c
   - src/core/lib/json/json_string.c
   - src/core/lib/json/json_writer.c
-  - src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c
   - src/core/lib/surface/alarm.c
   - src/core/lib/surface/api_trace.c
   - src/core/lib/surface/byte_buffer.c
@@ -466,6 +458,27 @@ filegroups:
   - include/grpc/impl/codegen/grpc_types.h
   - include/grpc/impl/codegen/propagation_bits.h
   - include/grpc/impl/codegen/status.h
+- name: grpc_lb_policy_grpclb
+  headers:
+  - src/core/ext/lb_policy/grpclb/load_balancer_api.h
+  - src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h
+  src:
+  - src/core/ext/lb_policy/grpclb/load_balancer_api.c
+  - src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c
+  uses:
+  - grpc_base
+- name: grpc_lb_policy_pick_first
+  src:
+  - src/core/ext/lb_policy/pick_first/pick_first.c
+  plugin: grpc_lb_policy_pick_first
+  uses:
+  - grpc_base
+- name: grpc_lb_policy_round_robin
+  src:
+  - src/core/ext/lb_policy/round_robin/round_robin.c
+  plugin: grpc_lb_policy_round_robin
+  uses:
+  - grpc_base
 - name: grpc_secure
   headers:
   - src/core/lib/security/auth_filters.h
@@ -639,10 +652,14 @@ libs:
   - grpc_transport_chttp2_client_secure
   - grpc_transport_chttp2_server_insecure
   - grpc_transport_chttp2_client_insecure
+  - grpc_lb_policy_grpclb
+  - grpc_lb_policy_pick_first
+  - grpc_lb_policy_round_robin
   - grpc_secure
   - grpc_codegen
   - census
   - nanopb
+  generate_plugin_registry: true
   secure: true
   vs_packages:
   - grpc.dependencies.openssl
@@ -722,9 +739,13 @@ libs:
   - grpc_base
   - grpc_transport_chttp2_server_insecure
   - grpc_transport_chttp2_client_insecure
+  - grpc_lb_policy_grpclb
+  - grpc_lb_policy_pick_first
+  - grpc_lb_policy_round_robin
   - grpc_codegen
   - census
   - nanopb
+  generate_plugin_registry: true
   secure: false
   vs_project_guid: '{46CEDFFF-9692-456A-AA24-38B5D6BCF4C5}'
 - name: grpc_zookeeper
@@ -1676,6 +1697,39 @@ targets:
   - grpc
   - gpr_test_util
   - gpr
+- name: internal_api_canary_iomgr_test
+  build: test
+  run: false
+  language: c
+  src:
+  - test/core/internal_api_canaries/iomgr.c
+  deps:
+  - grpc_test_util
+  - grpc
+  - gpr_test_util
+  - gpr
+- name: internal_api_canary_support_test
+  build: test
+  run: false
+  language: c
+  src:
+  - test/core/internal_api_canaries/iomgr.c
+  deps:
+  - grpc_test_util
+  - grpc
+  - gpr_test_util
+  - gpr
+- name: internal_api_canary_transport_test
+  build: test
+  run: false
+  language: c
+  src:
+  - test/core/internal_api_canaries/iomgr.c
+  deps:
+  - grpc_test_util
+  - grpc
+  - gpr_test_util
+  - gpr
 - name: invalid_call_argument_test
   build: test
   language: c
diff --git a/config.m4 b/config.m4
index 653b2870677dc9c5708c2086ac82b7d282b08804..1b414a1142b0eee54aa32d077badf8635b39bb59 100644
--- a/config.m4
+++ b/config.m4
@@ -80,6 +80,10 @@ if test "$PHP_GRPC" != "no"; then
     src/core/lib/support/tmpfile_posix.c \
     src/core/lib/support/tmpfile_win32.c \
     src/core/lib/support/wrap_memcpy.c \
+    src/core/ext/lb_policy/grpclb/load_balancer_api.c \
+    src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c \
+    src/core/ext/lb_policy/pick_first/pick_first.c \
+    src/core/ext/lb_policy/round_robin/round_robin.c \
     src/core/ext/transport/chttp2/client/insecure/channel_create.c \
     src/core/ext/transport/chttp2/client/secure/secure_channel_create.c \
     src/core/ext/transport/chttp2/server/insecure/server_chttp2.c \
@@ -127,9 +131,6 @@ if test "$PHP_GRPC" != "no"; then
     src/core/lib/client_config/connector.c \
     src/core/lib/client_config/default_initial_connect_string.c \
     src/core/lib/client_config/initial_connect_string.c \
-    src/core/lib/client_config/lb_policies/load_balancer_api.c \
-    src/core/lib/client_config/lb_policies/pick_first.c \
-    src/core/lib/client_config/lb_policies/round_robin.c \
     src/core/lib/client_config/lb_policy.c \
     src/core/lib/client_config/lb_policy_factory.c \
     src/core/lib/client_config/lb_policy_registry.c \
@@ -195,7 +196,6 @@ if test "$PHP_GRPC" != "no"; then
     src/core/lib/json/json_reader.c \
     src/core/lib/json/json_string.c \
     src/core/lib/json/json_writer.c \
-    src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c \
     src/core/lib/security/b64.c \
     src/core/lib/security/client_auth_filter.c \
     src/core/lib/security/credentials.c \
@@ -241,6 +241,7 @@ if test "$PHP_GRPC" != "no"; then
     src/core/lib/tsi/fake_transport_security.c \
     src/core/lib/tsi/ssl_transport_security.c \
     src/core/lib/tsi/transport_security.c \
+    src/core/plugin_registry/grpc_plugin_registry.c \
     third_party/nanopb/pb_common.c \
     third_party/nanopb/pb_decode.c \
     third_party/nanopb/pb_encode.c \
@@ -546,6 +547,10 @@ if test "$PHP_GRPC" != "no"; then
   PHP_ADD_BUILD_DIR($ext_builddir/src/php/ext/grpc)
 
   PHP_ADD_BUILD_DIR($ext_builddir/src/boringssl)
+  PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/lb_policy/grpclb)
+  PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0)
+  PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/lb_policy/pick_first)
+  PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/lb_policy/round_robin)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/transport/chttp2/client/insecure)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/transport/chttp2/client/secure)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/transport/chttp2/server/insecure)
@@ -554,7 +559,6 @@ if test "$PHP_GRPC" != "no"; then
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/census)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/channel)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/client_config)
-  PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/client_config/lb_policies)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/client_config/resolvers)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/compression)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/debug)
@@ -562,12 +566,12 @@ if test "$PHP_GRPC" != "no"; then
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/iomgr)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/json)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/profiling)
-  PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/proto/grpc/lb/v0)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/security)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/support)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/surface)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/transport)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/lib/tsi)
+  PHP_ADD_BUILD_DIR($ext_builddir/src/core/plugin_registry)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/boringssl/crypto)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/boringssl/crypto/aes)
   PHP_ADD_BUILD_DIR($ext_builddir/third_party/boringssl/crypto/asn1)
diff --git a/gRPC.podspec b/gRPC.podspec
index 08330eb8e180adea7f39516844f6da0ef906ca78..d94905ce2a6e7715c5edb231623123bb62a6c243 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -161,6 +161,8 @@ Pod::Spec.new do |s|
                       'src/core/lib/support/tmpfile_posix.c',
                       'src/core/lib/support/tmpfile_win32.c',
                       'src/core/lib/support/wrap_memcpy.c',
+                      'src/core/ext/lb_policy/grpclb/load_balancer_api.h',
+                      'src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h',
                       'src/core/ext/transport/chttp2/transport/alpn.h',
                       'src/core/ext/transport/chttp2/transport/bin_encoder.h',
                       'src/core/ext/transport/chttp2/transport/chttp2_transport.h',
@@ -200,9 +202,6 @@ Pod::Spec.new do |s|
                       'src/core/lib/client_config/client_config.h',
                       'src/core/lib/client_config/connector.h',
                       'src/core/lib/client_config/initial_connect_string.h',
-                      'src/core/lib/client_config/lb_policies/load_balancer_api.h',
-                      'src/core/lib/client_config/lb_policies/pick_first.h',
-                      'src/core/lib/client_config/lb_policies/round_robin.h',
                       'src/core/lib/client_config/lb_policy.h',
                       'src/core/lib/client_config/lb_policy_factory.h',
                       'src/core/lib/client_config/lb_policy_registry.h',
@@ -262,7 +261,6 @@ Pod::Spec.new do |s|
                       'src/core/lib/json/json_common.h',
                       'src/core/lib/json/json_reader.h',
                       'src/core/lib/json/json_writer.h',
-                      'src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h',
                       'src/core/lib/security/auth_filters.h',
                       'src/core/lib/security/b64.h',
                       'src/core/lib/security/credentials.h',
@@ -315,6 +313,10 @@ Pod::Spec.new do |s|
                       'include/grpc/impl/codegen/propagation_bits.h',
                       'include/grpc/impl/codegen/status.h',
                       'include/grpc/status.h',
+                      'src/core/ext/lb_policy/grpclb/load_balancer_api.c',
+                      'src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c',
+                      'src/core/ext/lb_policy/pick_first/pick_first.c',
+                      'src/core/ext/lb_policy/round_robin/round_robin.c',
                       'src/core/ext/transport/chttp2/client/insecure/channel_create.c',
                       'src/core/ext/transport/chttp2/client/secure/secure_channel_create.c',
                       'src/core/ext/transport/chttp2/server/insecure/server_chttp2.c',
@@ -362,9 +364,6 @@ Pod::Spec.new do |s|
                       'src/core/lib/client_config/connector.c',
                       'src/core/lib/client_config/default_initial_connect_string.c',
                       'src/core/lib/client_config/initial_connect_string.c',
-                      'src/core/lib/client_config/lb_policies/load_balancer_api.c',
-                      'src/core/lib/client_config/lb_policies/pick_first.c',
-                      'src/core/lib/client_config/lb_policies/round_robin.c',
                       'src/core/lib/client_config/lb_policy.c',
                       'src/core/lib/client_config/lb_policy_factory.c',
                       'src/core/lib/client_config/lb_policy_registry.c',
@@ -430,7 +429,6 @@ Pod::Spec.new do |s|
                       'src/core/lib/json/json_reader.c',
                       'src/core/lib/json/json_string.c',
                       'src/core/lib/json/json_writer.c',
-                      'src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c',
                       'src/core/lib/security/b64.c',
                       'src/core/lib/security/client_auth_filter.c',
                       'src/core/lib/security/credentials.c',
@@ -476,6 +474,7 @@ Pod::Spec.new do |s|
                       'src/core/lib/tsi/fake_transport_security.c',
                       'src/core/lib/tsi/ssl_transport_security.c',
                       'src/core/lib/tsi/transport_security.c',
+                      'src/core/plugin_registry/grpc_plugin_registry.c',
                       'third_party/nanopb/pb_common.c',
                       'third_party/nanopb/pb_decode.c',
                       'third_party/nanopb/pb_encode.c'
@@ -492,6 +491,8 @@ Pod::Spec.new do |s|
                               'src/core/lib/support/thd_internal.h',
                               'src/core/lib/support/time_precise.h',
                               'src/core/lib/support/tmpfile.h',
+                              'src/core/ext/lb_policy/grpclb/load_balancer_api.h',
+                              'src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h',
                               'src/core/ext/transport/chttp2/transport/alpn.h',
                               'src/core/ext/transport/chttp2/transport/bin_encoder.h',
                               'src/core/ext/transport/chttp2/transport/chttp2_transport.h',
@@ -531,9 +532,6 @@ Pod::Spec.new do |s|
                               'src/core/lib/client_config/client_config.h',
                               'src/core/lib/client_config/connector.h',
                               'src/core/lib/client_config/initial_connect_string.h',
-                              'src/core/lib/client_config/lb_policies/load_balancer_api.h',
-                              'src/core/lib/client_config/lb_policies/pick_first.h',
-                              'src/core/lib/client_config/lb_policies/round_robin.h',
                               'src/core/lib/client_config/lb_policy.h',
                               'src/core/lib/client_config/lb_policy_factory.h',
                               'src/core/lib/client_config/lb_policy_registry.h',
@@ -593,7 +591,6 @@ Pod::Spec.new do |s|
                               'src/core/lib/json/json_common.h',
                               'src/core/lib/json/json_reader.h',
                               'src/core/lib/json/json_writer.h',
-                              'src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h',
                               'src/core/lib/security/auth_filters.h',
                               'src/core/lib/security/b64.h',
                               'src/core/lib/security/credentials.h',
diff --git a/grpc.gemspec b/grpc.gemspec
index c516f5278f22a9c10782f60552f61655a2e8a613..e96bedb5875d5330d3d19a287784d2c01b8c14a4 100755
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -157,6 +157,8 @@ Gem::Specification.new do |s|
   s.files += %w( include/grpc/impl/codegen/propagation_bits.h )
   s.files += %w( include/grpc/impl/codegen/status.h )
   s.files += %w( include/grpc/status.h )
+  s.files += %w( src/core/ext/lb_policy/grpclb/load_balancer_api.h )
+  s.files += %w( src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h )
   s.files += %w( src/core/ext/transport/chttp2/transport/alpn.h )
   s.files += %w( src/core/ext/transport/chttp2/transport/bin_encoder.h )
   s.files += %w( src/core/ext/transport/chttp2/transport/chttp2_transport.h )
@@ -196,9 +198,6 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/lib/client_config/client_config.h )
   s.files += %w( src/core/lib/client_config/connector.h )
   s.files += %w( src/core/lib/client_config/initial_connect_string.h )
-  s.files += %w( src/core/lib/client_config/lb_policies/load_balancer_api.h )
-  s.files += %w( src/core/lib/client_config/lb_policies/pick_first.h )
-  s.files += %w( src/core/lib/client_config/lb_policies/round_robin.h )
   s.files += %w( src/core/lib/client_config/lb_policy.h )
   s.files += %w( src/core/lib/client_config/lb_policy_factory.h )
   s.files += %w( src/core/lib/client_config/lb_policy_registry.h )
@@ -258,7 +257,6 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/lib/json/json_common.h )
   s.files += %w( src/core/lib/json/json_reader.h )
   s.files += %w( src/core/lib/json/json_writer.h )
-  s.files += %w( src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h )
   s.files += %w( src/core/lib/security/auth_filters.h )
   s.files += %w( src/core/lib/security/b64.h )
   s.files += %w( src/core/lib/security/credentials.h )
@@ -298,6 +296,10 @@ Gem::Specification.new do |s|
   s.files += %w( third_party/nanopb/pb_common.h )
   s.files += %w( third_party/nanopb/pb_decode.h )
   s.files += %w( third_party/nanopb/pb_encode.h )
+  s.files += %w( src/core/ext/lb_policy/grpclb/load_balancer_api.c )
+  s.files += %w( src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c )
+  s.files += %w( src/core/ext/lb_policy/pick_first/pick_first.c )
+  s.files += %w( src/core/ext/lb_policy/round_robin/round_robin.c )
   s.files += %w( src/core/ext/transport/chttp2/client/insecure/channel_create.c )
   s.files += %w( src/core/ext/transport/chttp2/client/secure/secure_channel_create.c )
   s.files += %w( src/core/ext/transport/chttp2/server/insecure/server_chttp2.c )
@@ -345,9 +347,6 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/lib/client_config/connector.c )
   s.files += %w( src/core/lib/client_config/default_initial_connect_string.c )
   s.files += %w( src/core/lib/client_config/initial_connect_string.c )
-  s.files += %w( src/core/lib/client_config/lb_policies/load_balancer_api.c )
-  s.files += %w( src/core/lib/client_config/lb_policies/pick_first.c )
-  s.files += %w( src/core/lib/client_config/lb_policies/round_robin.c )
   s.files += %w( src/core/lib/client_config/lb_policy.c )
   s.files += %w( src/core/lib/client_config/lb_policy_factory.c )
   s.files += %w( src/core/lib/client_config/lb_policy_registry.c )
@@ -413,7 +412,6 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/lib/json/json_reader.c )
   s.files += %w( src/core/lib/json/json_string.c )
   s.files += %w( src/core/lib/json/json_writer.c )
-  s.files += %w( src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c )
   s.files += %w( src/core/lib/security/b64.c )
   s.files += %w( src/core/lib/security/client_auth_filter.c )
   s.files += %w( src/core/lib/security/credentials.c )
@@ -459,6 +457,7 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/lib/tsi/fake_transport_security.c )
   s.files += %w( src/core/lib/tsi/ssl_transport_security.c )
   s.files += %w( src/core/lib/tsi/transport_security.c )
+  s.files += %w( src/core/plugin_registry/grpc_plugin_registry.c )
   s.files += %w( third_party/nanopb/pb_common.c )
   s.files += %w( third_party/nanopb/pb_decode.c )
   s.files += %w( third_party/nanopb/pb_encode.c )
diff --git a/include/grpc/grpc.h b/include/grpc/grpc.h
index fe0cf28b3b3691fdca8f4c27e2f554245bf6e996..dbd2cc00007029c14b8e71bb55a29029f66da16d 100644
--- a/include/grpc/grpc.h
+++ b/include/grpc/grpc.h
@@ -297,7 +297,8 @@ GRPCAPI grpc_call_error grpc_server_request_call(
     Must be called before grpc_server_start.
     Returns NULL on failure. */
 GRPCAPI void *grpc_server_register_method(grpc_server *server,
-                                          const char *method, const char *host);
+                                          const char *method, const char *host,
+                                          uint32_t flags);
 
 /** Request notification of a new pre-registered call. 'cq_for_notification'
     must have been registered to the server via
diff --git a/include/grpc/impl/codegen/grpc_types.h b/include/grpc/impl/codegen/grpc_types.h
index b11f6ffec419528c92eb0bc876f33d01d9fed607..993fc97adb6809082d0a9f20724bd4101da77889 100644
--- a/include/grpc/impl/codegen/grpc_types.h
+++ b/include/grpc/impl/codegen/grpc_types.h
@@ -199,6 +199,12 @@ typedef enum grpc_call_error {
 /** Mask of all valid flags. */
 #define GRPC_WRITE_USED_MASK (GRPC_WRITE_BUFFER_HINT | GRPC_WRITE_NO_COMPRESS)
 
+/* Initial metadata flags */
+/** Signal that the call is idempotent */
+#define GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST (0x00000010u)
+/** Mask of all valid flags */
+#define GRPC_INITIAL_METADATA_USED_MASK GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST
+
 /** A single metadata element */
 typedef struct grpc_metadata {
   const char *key;
@@ -250,6 +256,7 @@ typedef struct {
   char *host;
   size_t host_capacity;
   gpr_timespec deadline;
+  uint32_t flags;
   void *reserved;
 } grpc_call_details;
 
diff --git a/package.json b/package.json
index 4da7c708f0bba56e5940b23b2e50ea9acccaa3c6..cbcfc19ee3cb4f1ae4a34655103dc9690a331bc8 100644
--- a/package.json
+++ b/package.json
@@ -100,6 +100,8 @@
     "include/grpc/impl/codegen/propagation_bits.h",
     "include/grpc/impl/codegen/status.h",
     "include/grpc/status.h",
+    "src/core/ext/lb_policy/grpclb/load_balancer_api.h",
+    "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h",
     "src/core/ext/transport/chttp2/transport/alpn.h",
     "src/core/ext/transport/chttp2/transport/bin_encoder.h",
     "src/core/ext/transport/chttp2/transport/chttp2_transport.h",
@@ -139,9 +141,6 @@
     "src/core/lib/client_config/client_config.h",
     "src/core/lib/client_config/connector.h",
     "src/core/lib/client_config/initial_connect_string.h",
-    "src/core/lib/client_config/lb_policies/load_balancer_api.h",
-    "src/core/lib/client_config/lb_policies/pick_first.h",
-    "src/core/lib/client_config/lb_policies/round_robin.h",
     "src/core/lib/client_config/lb_policy.h",
     "src/core/lib/client_config/lb_policy_factory.h",
     "src/core/lib/client_config/lb_policy_registry.h",
@@ -201,7 +200,6 @@
     "src/core/lib/json/json_common.h",
     "src/core/lib/json/json_reader.h",
     "src/core/lib/json/json_writer.h",
-    "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h",
     "src/core/lib/security/auth_filters.h",
     "src/core/lib/security/b64.h",
     "src/core/lib/security/credentials.h",
@@ -241,6 +239,10 @@
     "third_party/nanopb/pb_common.h",
     "third_party/nanopb/pb_decode.h",
     "third_party/nanopb/pb_encode.h",
+    "src/core/ext/lb_policy/grpclb/load_balancer_api.c",
+    "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c",
+    "src/core/ext/lb_policy/pick_first/pick_first.c",
+    "src/core/ext/lb_policy/round_robin/round_robin.c",
     "src/core/ext/transport/chttp2/client/insecure/channel_create.c",
     "src/core/ext/transport/chttp2/client/secure/secure_channel_create.c",
     "src/core/ext/transport/chttp2/server/insecure/server_chttp2.c",
@@ -288,9 +290,6 @@
     "src/core/lib/client_config/connector.c",
     "src/core/lib/client_config/default_initial_connect_string.c",
     "src/core/lib/client_config/initial_connect_string.c",
-    "src/core/lib/client_config/lb_policies/load_balancer_api.c",
-    "src/core/lib/client_config/lb_policies/pick_first.c",
-    "src/core/lib/client_config/lb_policies/round_robin.c",
     "src/core/lib/client_config/lb_policy.c",
     "src/core/lib/client_config/lb_policy_factory.c",
     "src/core/lib/client_config/lb_policy_registry.c",
@@ -356,7 +355,6 @@
     "src/core/lib/json/json_reader.c",
     "src/core/lib/json/json_string.c",
     "src/core/lib/json/json_writer.c",
-    "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c",
     "src/core/lib/security/b64.c",
     "src/core/lib/security/client_auth_filter.c",
     "src/core/lib/security/credentials.c",
@@ -402,6 +400,7 @@
     "src/core/lib/tsi/fake_transport_security.c",
     "src/core/lib/tsi/ssl_transport_security.c",
     "src/core/lib/tsi/transport_security.c",
+    "src/core/plugin_registry/grpc_plugin_registry.c",
     "third_party/nanopb/pb_common.c",
     "third_party/nanopb/pb_decode.c",
     "third_party/nanopb/pb_encode.c",
diff --git a/package.xml b/package.xml
index a40cd160ae5b02c7f3948945c6b0ae05b971233d..1caf850c561583d8aa728e68c3291d78be7a9ac3 100644
--- a/package.xml
+++ b/package.xml
@@ -161,6 +161,8 @@
     <file baseinstalldir="/" name="include/grpc/impl/codegen/propagation_bits.h" role="src" />
     <file baseinstalldir="/" name="include/grpc/impl/codegen/status.h" role="src" />
     <file baseinstalldir="/" name="include/grpc/status.h" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/lb_policy/grpclb/load_balancer_api.h" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/transport/chttp2/transport/alpn.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/transport/chttp2/transport/bin_encoder.h" role="src" />
     <file baseinstalldir="/" name="src/core/ext/transport/chttp2/transport/chttp2_transport.h" role="src" />
@@ -200,9 +202,6 @@
     <file baseinstalldir="/" name="src/core/lib/client_config/client_config.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/connector.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/initial_connect_string.h" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/client_config/lb_policies/load_balancer_api.h" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/client_config/lb_policies/pick_first.h" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/client_config/lb_policies/round_robin.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/lb_policy.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/lb_policy_factory.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/lb_policy_registry.h" role="src" />
@@ -262,7 +261,6 @@
     <file baseinstalldir="/" name="src/core/lib/json/json_common.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/json/json_reader.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/json/json_writer.h" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/security/auth_filters.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/security/b64.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/security/credentials.h" role="src" />
@@ -302,6 +300,10 @@
     <file baseinstalldir="/" name="third_party/nanopb/pb_common.h" role="src" />
     <file baseinstalldir="/" name="third_party/nanopb/pb_decode.h" role="src" />
     <file baseinstalldir="/" name="third_party/nanopb/pb_encode.h" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/lb_policy/grpclb/load_balancer_api.c" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/lb_policy/pick_first/pick_first.c" role="src" />
+    <file baseinstalldir="/" name="src/core/ext/lb_policy/round_robin/round_robin.c" role="src" />
     <file baseinstalldir="/" name="src/core/ext/transport/chttp2/client/insecure/channel_create.c" role="src" />
     <file baseinstalldir="/" name="src/core/ext/transport/chttp2/client/secure/secure_channel_create.c" role="src" />
     <file baseinstalldir="/" name="src/core/ext/transport/chttp2/server/insecure/server_chttp2.c" role="src" />
@@ -349,9 +351,6 @@
     <file baseinstalldir="/" name="src/core/lib/client_config/connector.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/default_initial_connect_string.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/initial_connect_string.c" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/client_config/lb_policies/load_balancer_api.c" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/client_config/lb_policies/pick_first.c" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/client_config/lb_policies/round_robin.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/lb_policy.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/lb_policy_factory.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/client_config/lb_policy_registry.c" role="src" />
@@ -417,7 +416,6 @@
     <file baseinstalldir="/" name="src/core/lib/json/json_reader.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/json/json_string.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/json/json_writer.c" role="src" />
-    <file baseinstalldir="/" name="src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/security/b64.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/security/client_auth_filter.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/security/credentials.c" role="src" />
@@ -463,6 +461,7 @@
     <file baseinstalldir="/" name="src/core/lib/tsi/fake_transport_security.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/tsi/ssl_transport_security.c" role="src" />
     <file baseinstalldir="/" name="src/core/lib/tsi/transport_security.c" role="src" />
+    <file baseinstalldir="/" name="src/core/plugin_registry/grpc_plugin_registry.c" role="src" />
     <file baseinstalldir="/" name="third_party/nanopb/pb_common.c" role="src" />
     <file baseinstalldir="/" name="third_party/nanopb/pb_decode.c" role="src" />
     <file baseinstalldir="/" name="third_party/nanopb/pb_encode.c" role="src" />
diff --git a/src/core/lib/client_config/lb_policies/load_balancer_api.c b/src/core/ext/lb_policy/grpclb/load_balancer_api.c
similarity index 98%
rename from src/core/lib/client_config/lb_policies/load_balancer_api.c
rename to src/core/ext/lb_policy/grpclb/load_balancer_api.c
index 4cbed200df336612a88980141f51f15b317f5659..d8af644870d4f9d4bb1d3c4e46d9a9ddf92d1401 100644
--- a/src/core/lib/client_config/lb_policies/load_balancer_api.c
+++ b/src/core/ext/lb_policy/grpclb/load_balancer_api.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/client_config/lb_policies/load_balancer_api.h"
+#include "src/core/ext/lb_policy/grpclb/load_balancer_api.h"
 #include "third_party/nanopb/pb_decode.h"
 #include "third_party/nanopb/pb_encode.h"
 
diff --git a/src/core/lib/client_config/lb_policies/load_balancer_api.h b/src/core/ext/lb_policy/grpclb/load_balancer_api.h
similarity index 91%
rename from src/core/lib/client_config/lb_policies/load_balancer_api.h
rename to src/core/ext/lb_policy/grpclb/load_balancer_api.h
index 83299adfa9d0be314ff691cd0d9ecca47b6867a2..d329a2ffe825d1963782ff1a3bf1cef6da7f3e8f 100644
--- a/src/core/lib/client_config/lb_policies/load_balancer_api.h
+++ b/src/core/ext/lb_policy/grpclb/load_balancer_api.h
@@ -31,13 +31,13 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_LOAD_BALANCER_API_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_LOAD_BALANCER_API_H
+#ifndef GRPC_CORE_EXT_LB_POLICY_GRPCLB_LOAD_BALANCER_API_H
+#define GRPC_CORE_EXT_LB_POLICY_GRPCLB_LOAD_BALANCER_API_H
 
 #include <grpc/support/slice_buffer.h>
 
+#include "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h"
 #include "src/core/lib/client_config/lb_policy_factory.h"
-#include "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -82,4 +82,4 @@ void grpc_grpclb_response_destroy(grpc_grpclb_response *response);
 }
 #endif
 
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_LOAD_BALANCER_API_H */
+#endif /* GRPC_CORE_EXT_LB_POLICY_GRPCLB_LOAD_BALANCER_API_H */
diff --git a/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c b/src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c
similarity index 98%
rename from src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c
rename to src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c
index 8f82141f96d525ec6135cefe6726509560928484..97196731810e71f15122f1efd882d5b3cfdeab57 100644
--- a/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c
+++ b/src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c
@@ -33,7 +33,7 @@
 /* Automatically generated nanopb constant definitions */
 /* Generated by nanopb-0.3.5-dev */
 
-#include "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h"
+#include "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h"
 
 #if PB_PROTO_HEADER_VERSION != 30
 #error Regenerate this file with the current version of nanopb generator.
diff --git a/src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h b/src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h
similarity index 100%
rename from src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h
rename to src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h
diff --git a/src/core/lib/client_config/lb_policies/pick_first.c b/src/core/ext/lb_policy/pick_first/pick_first.c
similarity index 93%
rename from src/core/lib/client_config/lb_policies/pick_first.c
rename to src/core/ext/lb_policy/pick_first/pick_first.c
index 9ac550d9e7cd6438e5fe6d4d110afc3b4b8c614c..95fe372c1b6d91eab26c8f97d901dfa8eeb16370 100644
--- a/src/core/lib/client_config/lb_policies/pick_first.c
+++ b/src/core/ext/lb_policy/pick_first/pick_first.c
@@ -31,12 +31,10 @@
  *
  */
 
-#include "src/core/lib/client_config/lb_policies/pick_first.h"
-
 #include <string.h>
 
 #include <grpc/support/alloc.h>
-#include "src/core/lib/client_config/lb_policy_factory.h"
+#include "src/core/lib/client_config/lb_policy_registry.h"
 #include "src/core/lib/transport/connectivity_state.h"
 
 typedef struct pending_pick {
@@ -78,7 +76,7 @@ typedef struct {
 #define GET_SELECTED(p) \
   ((grpc_connected_subchannel *)gpr_atm_acq_load(&(p)->selected))
 
-void pf_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
+static void pf_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
   grpc_connected_subchannel *selected = GET_SELECTED(p);
   size_t i;
@@ -95,7 +93,7 @@ void pf_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   gpr_free(p);
 }
 
-void pf_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
+static void pf_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
   pending_pick *pp;
   grpc_connected_subchannel *selected;
@@ -162,7 +160,7 @@ static void start_picking(grpc_exec_ctx *exec_ctx, pick_first_lb_policy *p) {
       &p->connectivity_changed);
 }
 
-void pf_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
+static void pf_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
   gpr_mu_lock(&p->mu);
   if (!p->started_picking) {
@@ -171,9 +169,10 @@ void pf_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   gpr_mu_unlock(&p->mu);
 }
 
-int pf_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, grpc_pollset *pollset,
-            grpc_metadata_batch *initial_metadata,
-            grpc_connected_subchannel **target, grpc_closure *on_complete) {
+static int pf_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
+                   grpc_pollset *pollset, grpc_metadata_batch *initial_metadata,
+                   grpc_connected_subchannel **target,
+                   grpc_closure *on_complete) {
   pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
   pending_pick *pp;
 
@@ -356,9 +355,10 @@ static grpc_connectivity_state pf_check_connectivity(grpc_exec_ctx *exec_ctx,
   return st;
 }
 
-void pf_notify_on_state_change(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
-                               grpc_connectivity_state *current,
-                               grpc_closure *notify) {
+static void pf_notify_on_state_change(grpc_exec_ctx *exec_ctx,
+                                      grpc_lb_policy *pol,
+                                      grpc_connectivity_state *current,
+                                      grpc_closure *notify) {
   pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
   gpr_mu_lock(&p->mu);
   grpc_connectivity_state_notify_on_state_change(exec_ctx, &p->state_tracker,
@@ -366,8 +366,8 @@ void pf_notify_on_state_change(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
   gpr_mu_unlock(&p->mu);
 }
 
-void pf_ping_one(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
-                 grpc_closure *closure) {
+static void pf_ping_one(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
+                        grpc_closure *closure) {
   pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
   grpc_connected_subchannel *selected = GET_SELECTED(p);
   if (selected) {
@@ -439,6 +439,14 @@ static const grpc_lb_policy_factory_vtable pick_first_factory_vtable = {
 static grpc_lb_policy_factory pick_first_lb_policy_factory = {
     &pick_first_factory_vtable};
 
-grpc_lb_policy_factory *grpc_pick_first_lb_factory_create() {
+static grpc_lb_policy_factory *pick_first_lb_factory_create() {
   return &pick_first_lb_policy_factory;
 }
+
+/* Plugin registration */
+
+void grpc_lb_policy_pick_first_init() {
+  grpc_register_lb_policy(pick_first_lb_factory_create());
+}
+
+void grpc_lb_policy_pick_first_shutdown() {}
diff --git a/src/core/lib/client_config/lb_policies/round_robin.c b/src/core/ext/lb_policy/round_robin/round_robin.c
similarity index 95%
rename from src/core/lib/client_config/lb_policies/round_robin.c
rename to src/core/ext/lb_policy/round_robin/round_robin.c
index a4bc2c478610e72e415fa0a51417974ddfe807c1..eb6cccdca9f301ac3be25459df22c5495931c5a6 100644
--- a/src/core/lib/client_config/lb_policies/round_robin.c
+++ b/src/core/ext/lb_policy/round_robin/round_robin.c
@@ -31,11 +31,12 @@
  *
  */
 
-#include "src/core/lib/client_config/lb_policies/round_robin.h"
-
 #include <string.h>
 
 #include <grpc/support/alloc.h>
+
+#include "src/core/lib/client_config/lb_policy_registry.h"
+#include "src/core/lib/debug/trace.h"
 #include "src/core/lib/transport/connectivity_state.h"
 
 typedef struct round_robin_lb_policy round_robin_lb_policy;
@@ -199,7 +200,7 @@ static void remove_disconnected_sc_locked(round_robin_lb_policy *p,
   gpr_free(node);
 }
 
-void rr_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
+static void rr_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
   size_t i;
   ready_list *elem;
@@ -226,7 +227,7 @@ void rr_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   gpr_free(p);
 }
 
-void rr_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
+static void rr_shutdown(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
   pending_pick *pp;
   size_t i;
@@ -291,7 +292,7 @@ static void start_picking(grpc_exec_ctx *exec_ctx, round_robin_lb_policy *p) {
   }
 }
 
-void rr_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
+static void rr_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
   gpr_mu_lock(&p->mu);
   if (!p->started_picking) {
@@ -300,9 +301,10 @@ void rr_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
   gpr_mu_unlock(&p->mu);
 }
 
-int rr_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, grpc_pollset *pollset,
-            grpc_metadata_batch *initial_metadata,
-            grpc_connected_subchannel **target, grpc_closure *on_complete) {
+static int rr_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol,
+                   grpc_pollset *pollset, grpc_metadata_batch *initial_metadata,
+                   grpc_connected_subchannel **target,
+                   grpc_closure *on_complete) {
   round_robin_lb_policy *p = (round_robin_lb_policy *)pol;
   pending_pick *pp;
   ready_list *selected;
@@ -558,6 +560,15 @@ static const grpc_lb_policy_factory_vtable round_robin_factory_vtable = {
 static grpc_lb_policy_factory round_robin_lb_policy_factory = {
     &round_robin_factory_vtable};
 
-grpc_lb_policy_factory *grpc_round_robin_lb_factory_create() {
+static grpc_lb_policy_factory *round_robin_lb_factory_create() {
   return &round_robin_lb_policy_factory;
 }
+
+/* Plugin registration */
+
+void grpc_lb_policy_round_robin_init() {
+  grpc_register_lb_policy(round_robin_lb_factory_create());
+  grpc_register_tracer("round_robin", &grpc_lb_round_robin_trace);
+}
+
+void grpc_lb_policy_round_robin_shutdown() {}
diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.c b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
index 0a307a73a642fb5e709fbc58f70c4d5a4b7f8914..b835e74c56cda6b7e37dcae3500a0759de3bd8f9 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.c
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
@@ -758,23 +758,35 @@ static void maybe_start_some_streams(
   }
 }
 
+#define CLOSURE_BARRIER_STATS_BIT (1 << 0)
+#define CLOSURE_BARRIER_FAILURE_BIT (1 << 1)
+#define CLOSURE_BARRIER_FIRST_REF_BIT (1 << 16)
+
 static grpc_closure *add_closure_barrier(grpc_closure *closure) {
-  closure->final_data += 2;
+  closure->final_data += CLOSURE_BARRIER_FIRST_REF_BIT;
   return closure;
 }
 
 void grpc_chttp2_complete_closure_step(grpc_exec_ctx *exec_ctx,
+                                       grpc_chttp2_stream_global *stream_global,
                                        grpc_closure **pclosure, int success) {
   grpc_closure *closure = *pclosure;
   if (closure == NULL) {
     return;
   }
-  closure->final_data -= 2;
+  closure->final_data -= CLOSURE_BARRIER_FIRST_REF_BIT;
   if (!success) {
-    closure->final_data |= 1;
+    closure->final_data |= CLOSURE_BARRIER_FAILURE_BIT;
   }
-  if (closure->final_data < 2) {
-    grpc_exec_ctx_enqueue(exec_ctx, closure, closure->final_data == 0, NULL);
+  if (closure->final_data < CLOSURE_BARRIER_FIRST_REF_BIT) {
+    if (closure->final_data & CLOSURE_BARRIER_STATS_BIT) {
+      grpc_transport_move_stats(&stream_global->stats,
+                                stream_global->collecting_stats);
+      stream_global->collecting_stats = NULL;
+    }
+    grpc_exec_ctx_enqueue(
+        exec_ctx, closure,
+        (closure->final_data & CLOSURE_BARRIER_FAILURE_BIT) == 0, NULL);
   }
   *pclosure = NULL;
 }
@@ -807,7 +819,13 @@ static void perform_stream_op_locked(
   }
   /* use final_data as a barrier until enqueue time; the inital counter is
      dropped at the end of this function */
-  on_complete->final_data = 2;
+  on_complete->final_data = CLOSURE_BARRIER_FIRST_REF_BIT;
+
+  if (op->collect_stats != NULL) {
+    GPR_ASSERT(stream_global->collecting_stats == NULL);
+    stream_global->collecting_stats = op->collect_stats;
+    on_complete->final_data |= CLOSURE_BARRIER_STATS_BIT;
+  }
 
   if (op->cancel_with_status != GRPC_STATUS_OK) {
     cancel_from_api(exec_ctx, transport_global, stream_global,
@@ -840,7 +858,8 @@ static void perform_stream_op_locked(
       }
     } else {
       grpc_chttp2_complete_closure_step(
-          exec_ctx, &stream_global->send_initial_metadata_finished, 0);
+          exec_ctx, stream_global,
+          &stream_global->send_initial_metadata_finished, 0);
     }
   }
 
@@ -850,7 +869,7 @@ static void perform_stream_op_locked(
     stream_global->send_message_finished = add_closure_barrier(on_complete);
     if (stream_global->write_closed) {
       grpc_chttp2_complete_closure_step(
-          exec_ctx, &stream_global->send_message_finished, 0);
+          exec_ctx, stream_global, &stream_global->send_message_finished, 0);
     } else {
       stream_global->send_message = op->send_message;
       if (stream_global->id != 0) {
@@ -870,7 +889,8 @@ static void perform_stream_op_locked(
     }
     if (stream_global->write_closed) {
       grpc_chttp2_complete_closure_step(
-          exec_ctx, &stream_global->send_trailing_metadata_finished,
+          exec_ctx, stream_global,
+          &stream_global->send_trailing_metadata_finished,
           grpc_metadata_batch_is_empty(op->send_trailing_metadata));
     } else if (stream_global->id != 0) {
       /* TODO(ctiller): check if there's flow control for any outstanding
@@ -909,7 +929,7 @@ static void perform_stream_op_locked(
     grpc_chttp2_list_add_check_read_ops(transport_global, stream_global);
   }
 
-  grpc_chttp2_complete_closure_step(exec_ctx, &on_complete, 1);
+  grpc_chttp2_complete_closure_step(exec_ctx, stream_global, &on_complete, 1);
 
   GPR_TIMER_END("perform_stream_op_locked", 0);
 }
@@ -1080,7 +1100,8 @@ static void check_read_ops(grpc_exec_ctx *exec_ctx,
             &stream_global->received_trailing_metadata,
             stream_global->recv_trailing_metadata);
         grpc_chttp2_complete_closure_step(
-            exec_ctx, &stream_global->recv_trailing_metadata_finished, 1);
+            exec_ctx, stream_global,
+            &stream_global->recv_trailing_metadata_finished, 1);
       }
     }
   }
@@ -1131,7 +1152,8 @@ static void cancel_from_api(grpc_exec_ctx *exec_ctx,
         &transport_global->qbuf,
         grpc_chttp2_rst_stream_create(
             stream_global->id,
-            (uint32_t)grpc_chttp2_grpc_status_to_http2_error(status)));
+            (uint32_t)grpc_chttp2_grpc_status_to_http2_error(status),
+            &stream_global->stats.outgoing));
   }
   grpc_chttp2_fake_status(exec_ctx, transport_global, stream_global, status,
                           NULL);
@@ -1179,10 +1201,12 @@ void grpc_chttp2_fake_status(grpc_exec_ctx *exec_ctx,
 static void fail_pending_writes(grpc_exec_ctx *exec_ctx,
                                 grpc_chttp2_stream_global *stream_global) {
   grpc_chttp2_complete_closure_step(
-      exec_ctx, &stream_global->send_initial_metadata_finished, 0);
+      exec_ctx, stream_global, &stream_global->send_initial_metadata_finished,
+      0);
   grpc_chttp2_complete_closure_step(
-      exec_ctx, &stream_global->send_trailing_metadata_finished, 0);
-  grpc_chttp2_complete_closure_step(exec_ctx,
+      exec_ctx, stream_global, &stream_global->send_trailing_metadata_finished,
+      0);
+  grpc_chttp2_complete_closure_step(exec_ctx, stream_global,
                                     &stream_global->send_message_finished, 0);
 }
 
@@ -1319,7 +1343,8 @@ static void close_from_api(grpc_exec_ctx *exec_ctx,
 
   gpr_slice_buffer_add(
       &transport_global->qbuf,
-      grpc_chttp2_rst_stream_create(stream_global->id, GRPC_CHTTP2_NO_ERROR));
+      grpc_chttp2_rst_stream_create(stream_global->id, GRPC_CHTTP2_NO_ERROR,
+                                    &stream_global->stats.outgoing));
 
   if (optional_message) {
     gpr_slice_ref(*optional_message);
diff --git a/src/core/ext/transport/chttp2/transport/frame_data.c b/src/core/ext/transport/chttp2/transport/frame_data.c
index cdd624647c8b117022c599bfd243a57e4e44db0b..baa66e0008ddc4b514a50d762d8ed48fba33c8b0 100644
--- a/src/core/ext/transport/chttp2/transport/frame_data.c
+++ b/src/core/ext/transport/chttp2/transport/frame_data.c
@@ -113,11 +113,13 @@ grpc_byte_stream *grpc_chttp2_incoming_frame_queue_pop(
 
 void grpc_chttp2_encode_data(uint32_t id, gpr_slice_buffer *inbuf,
                              uint32_t write_bytes, int is_eof,
+                             grpc_transport_one_way_stats *stats,
                              gpr_slice_buffer *outbuf) {
   gpr_slice hdr;
   uint8_t *p;
+  static const size_t header_size = 9;
 
-  hdr = gpr_slice_malloc(9);
+  hdr = gpr_slice_malloc(header_size);
   p = GPR_SLICE_START_PTR(hdr);
   GPR_ASSERT(write_bytes < (1 << 24));
   *p++ = (uint8_t)(write_bytes >> 16);
@@ -132,6 +134,9 @@ void grpc_chttp2_encode_data(uint32_t id, gpr_slice_buffer *inbuf,
   gpr_slice_buffer_add(outbuf, hdr);
 
   gpr_slice_buffer_move_first(inbuf, write_bytes, outbuf);
+
+  stats->framing_bytes += header_size;
+  stats->data_bytes += write_bytes;
 }
 
 grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
@@ -156,6 +161,7 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
   switch (p->state) {
   fh_0:
     case GRPC_CHTTP2_DATA_FH_0:
+      stream_parsing->stats.incoming.framing_bytes++;
       p->frame_type = *cur;
       switch (p->frame_type) {
         case 0:
@@ -174,6 +180,7 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
       }
     /* fallthrough */
     case GRPC_CHTTP2_DATA_FH_1:
+      stream_parsing->stats.incoming.framing_bytes++;
       p->frame_size = ((uint32_t)*cur) << 24;
       if (++cur == end) {
         p->state = GRPC_CHTTP2_DATA_FH_2;
@@ -181,6 +188,7 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
       }
     /* fallthrough */
     case GRPC_CHTTP2_DATA_FH_2:
+      stream_parsing->stats.incoming.framing_bytes++;
       p->frame_size |= ((uint32_t)*cur) << 16;
       if (++cur == end) {
         p->state = GRPC_CHTTP2_DATA_FH_3;
@@ -188,6 +196,7 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
       }
     /* fallthrough */
     case GRPC_CHTTP2_DATA_FH_3:
+      stream_parsing->stats.incoming.framing_bytes++;
       p->frame_size |= ((uint32_t)*cur) << 8;
       if (++cur == end) {
         p->state = GRPC_CHTTP2_DATA_FH_4;
@@ -195,6 +204,7 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
       }
     /* fallthrough */
     case GRPC_CHTTP2_DATA_FH_4:
+      stream_parsing->stats.incoming.framing_bytes++;
       p->frame_size |= ((uint32_t)*cur);
       p->state = GRPC_CHTTP2_DATA_FRAME;
       ++cur;
@@ -215,7 +225,9 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
       }
       grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
                                                stream_parsing);
-      if ((uint32_t)(end - cur) == p->frame_size) {
+      uint32_t remaining = (uint32_t)(end - cur);
+      if (remaining == p->frame_size) {
+        stream_parsing->stats.incoming.data_bytes += p->frame_size;
         grpc_chttp2_incoming_byte_stream_push(
             exec_ctx, p->parsing_frame,
             gpr_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
@@ -224,7 +236,8 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
         p->parsing_frame = NULL;
         p->state = GRPC_CHTTP2_DATA_FH_0;
         return GRPC_CHTTP2_PARSE_OK;
-      } else if ((uint32_t)(end - cur) > p->frame_size) {
+      } else if (remaining > p->frame_size) {
+        stream_parsing->stats.incoming.data_bytes += p->frame_size;
         grpc_chttp2_incoming_byte_stream_push(
             exec_ctx, p->parsing_frame,
             gpr_slice_sub(slice, (size_t)(cur - beg),
@@ -235,11 +248,12 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
         cur += p->frame_size;
         goto fh_0; /* loop */
       } else {
+        GPR_ASSERT(remaining <= p->frame_size);
         grpc_chttp2_incoming_byte_stream_push(
             exec_ctx, p->parsing_frame,
             gpr_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
-        GPR_ASSERT((size_t)(end - cur) <= p->frame_size);
-        p->frame_size -= (uint32_t)(end - cur);
+        p->frame_size -= remaining;
+        stream_parsing->stats.incoming.data_bytes += remaining;
         return GRPC_CHTTP2_PARSE_OK;
       }
   }
diff --git a/src/core/ext/transport/chttp2/transport/frame_data.h b/src/core/ext/transport/chttp2/transport/frame_data.h
index f2762ed9de8b2b42403c54fceea00853233aca7f..8a073a9c11b77c2580df28fc0052b3e02ff88c87 100644
--- a/src/core/ext/transport/chttp2/transport/frame_data.h
+++ b/src/core/ext/transport/chttp2/transport/frame_data.h
@@ -41,6 +41,7 @@
 #include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
 #include "src/core/lib/transport/byte_stream.h"
+#include "src/core/lib/transport/transport.h"
 
 typedef enum {
   GRPC_CHTTP2_DATA_FH_0,
@@ -96,6 +97,7 @@ grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
 
 void grpc_chttp2_encode_data(uint32_t id, gpr_slice_buffer *inbuf,
                              uint32_t write_bytes, int is_eof,
+                             grpc_transport_one_way_stats *stats,
                              gpr_slice_buffer *outbuf);
 
 #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_DATA_H */
diff --git a/src/core/ext/transport/chttp2/transport/frame_rst_stream.c b/src/core/ext/transport/chttp2/transport/frame_rst_stream.c
index acfc3627e8558f57560e4f9240b779384e7bd81c..d9a04bbf3c37c348f55b69f6d3f391a1beba9229 100644
--- a/src/core/ext/transport/chttp2/transport/frame_rst_stream.c
+++ b/src/core/ext/transport/chttp2/transport/frame_rst_stream.c
@@ -38,8 +38,11 @@
 
 #include "src/core/ext/transport/chttp2/transport/frame.h"
 
-gpr_slice grpc_chttp2_rst_stream_create(uint32_t id, uint32_t code) {
-  gpr_slice slice = gpr_slice_malloc(13);
+gpr_slice grpc_chttp2_rst_stream_create(uint32_t id, uint32_t code,
+                                        grpc_transport_one_way_stats *stats) {
+  static const size_t frame_size = 13;
+  gpr_slice slice = gpr_slice_malloc(frame_size);
+  stats->framing_bytes += frame_size;
   uint8_t *p = GPR_SLICE_START_PTR(slice);
 
   *p++ = 0;
@@ -84,6 +87,7 @@ grpc_chttp2_parse_error grpc_chttp2_rst_stream_parser_parse(
     cur++;
     p->byte++;
   }
+  stream_parsing->stats.incoming.framing_bytes += (uint64_t)(end - cur);
 
   if (p->byte == 4) {
     GPR_ASSERT(is_last);
diff --git a/src/core/ext/transport/chttp2/transport/frame_rst_stream.h b/src/core/ext/transport/chttp2/transport/frame_rst_stream.h
index 134f1368a01a7e3681ccdbbd6c4ba7f948115dee..729274e9a206283e0504e429b8ad0ab18efdfe72 100644
--- a/src/core/ext/transport/chttp2/transport/frame_rst_stream.h
+++ b/src/core/ext/transport/chttp2/transport/frame_rst_stream.h
@@ -37,13 +37,15 @@
 #include <grpc/support/slice.h>
 #include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
+#include "src/core/lib/transport/transport.h"
 
 typedef struct {
   uint8_t byte;
   uint8_t reason_bytes[4];
 } grpc_chttp2_rst_stream_parser;
 
-gpr_slice grpc_chttp2_rst_stream_create(uint32_t stream_id, uint32_t code);
+gpr_slice grpc_chttp2_rst_stream_create(uint32_t stream_id, uint32_t code,
+                                        grpc_transport_one_way_stats *stats);
 
 grpc_chttp2_parse_error grpc_chttp2_rst_stream_parser_begin_frame(
     grpc_chttp2_rst_stream_parser *parser, uint32_t length, uint8_t flags);
diff --git a/src/core/ext/transport/chttp2/transport/frame_window_update.c b/src/core/ext/transport/chttp2/transport/frame_window_update.c
index 1a561cebafb876940d462512f9d197f5d2e040c2..0baf6d2fdd438c7f8b07c876b9dc9dc24f1c1140 100644
--- a/src/core/ext/transport/chttp2/transport/frame_window_update.c
+++ b/src/core/ext/transport/chttp2/transport/frame_window_update.c
@@ -36,9 +36,11 @@
 
 #include <grpc/support/log.h>
 
-gpr_slice grpc_chttp2_window_update_create(uint32_t id,
-                                           uint32_t window_update) {
-  gpr_slice slice = gpr_slice_malloc(13);
+gpr_slice grpc_chttp2_window_update_create(
+    uint32_t id, uint32_t window_update, grpc_transport_one_way_stats *stats) {
+  static const size_t frame_size = 13;
+  gpr_slice slice = gpr_slice_malloc(frame_size);
+  stats->header_bytes += frame_size;
   uint8_t *p = GPR_SLICE_START_PTR(slice);
 
   GPR_ASSERT(window_update);
@@ -87,6 +89,10 @@ grpc_chttp2_parse_error grpc_chttp2_window_update_parser_parse(
     p->byte++;
   }
 
+  if (stream_parsing != NULL) {
+    stream_parsing->stats.incoming.framing_bytes += (uint32_t)(end - cur);
+  }
+
   if (p->byte == 4) {
     uint32_t received_update = p->amount;
     if (received_update == 0 || (received_update & 0x80000000u)) {
diff --git a/src/core/ext/transport/chttp2/transport/frame_window_update.h b/src/core/ext/transport/chttp2/transport/frame_window_update.h
index f9f670b6f14cdd468d41cdd0f6c1f10f359a0953..a1093a6041c0a4c61ac18356c6ac7db94cca76c2 100644
--- a/src/core/ext/transport/chttp2/transport/frame_window_update.h
+++ b/src/core/ext/transport/chttp2/transport/frame_window_update.h
@@ -37,6 +37,7 @@
 #include <grpc/support/slice.h>
 #include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
+#include "src/core/lib/transport/transport.h"
 
 typedef struct {
   uint8_t byte;
@@ -44,7 +45,8 @@ typedef struct {
   uint32_t amount;
 } grpc_chttp2_window_update_parser;
 
-gpr_slice grpc_chttp2_window_update_create(uint32_t id, uint32_t window_delta);
+gpr_slice grpc_chttp2_window_update_create(uint32_t id, uint32_t window_delta,
+                                           grpc_transport_one_way_stats *stats);
 
 grpc_chttp2_parse_error grpc_chttp2_window_update_parser_begin_frame(
     grpc_chttp2_window_update_parser *parser, uint32_t length, uint8_t flags);
diff --git a/src/core/ext/transport/chttp2/transport/hpack_encoder.c b/src/core/ext/transport/chttp2/transport/hpack_encoder.c
index 819addd9e30411c0b6a860aa093d50f887821fb7..880305afdd094994b78947e8d3b84e6200416eb0 100644
--- a/src/core/ext/transport/chttp2/transport/hpack_encoder.c
+++ b/src/core/ext/transport/chttp2/transport/hpack_encoder.c
@@ -74,6 +74,7 @@ typedef struct {
   /* output stream id */
   uint32_t stream_id;
   gpr_slice_buffer *output;
+  grpc_transport_one_way_stats *stats;
 } framer_state;
 
 /* fills p (which is expected to be 9 bytes long) with a data frame header */
@@ -102,6 +103,7 @@ static void finish_frame(framer_state *st, int is_header_boundary,
       st->stream_id, st->output->length - st->output_length_at_start_of_frame,
       (uint8_t)((is_last_in_stream ? GRPC_CHTTP2_DATA_FLAG_END_STREAM : 0) |
                 (is_header_boundary ? GRPC_CHTTP2_DATA_FLAG_END_HEADERS : 0)));
+  st->stats->framing_bytes += 9;
   st->is_first_frame = 0;
 }
 
@@ -147,8 +149,10 @@ static void add_header_data(framer_state *st, gpr_slice slice) {
   remaining = GRPC_CHTTP2_MAX_PAYLOAD_LENGTH +
               st->output_length_at_start_of_frame - st->output->length;
   if (len <= remaining) {
+    st->stats->header_bytes += len;
     gpr_slice_buffer_add(st->output, slice);
   } else {
+    st->stats->header_bytes += remaining;
     gpr_slice_buffer_add(st->output, gpr_slice_split_head(&slice, remaining));
     finish_frame(st, 0, 0);
     begin_frame(st);
@@ -535,6 +539,7 @@ void grpc_chttp2_hpack_compressor_set_max_table_size(
 void grpc_chttp2_encode_header(grpc_chttp2_hpack_compressor *c,
                                uint32_t stream_id,
                                grpc_metadata_batch *metadata, int is_eof,
+                               grpc_transport_one_way_stats *stats,
                                gpr_slice_buffer *outbuf) {
   framer_state st;
   grpc_linked_mdelem *l;
@@ -546,6 +551,7 @@ void grpc_chttp2_encode_header(grpc_chttp2_hpack_compressor *c,
   st.stream_id = stream_id;
   st.output = outbuf;
   st.is_first_frame = 1;
+  st.stats = stats;
 
   /* Encode a metadata batch; store the returned values, representing
      a metadata element that needs to be unreffed back into the metadata
diff --git a/src/core/ext/transport/chttp2/transport/hpack_encoder.h b/src/core/ext/transport/chttp2/transport/hpack_encoder.h
index d79de35979c6d0675768a8dc0cfdcc41cd8c166f..91c368fbe235111c91275d7ae2503676d1889aad 100644
--- a/src/core/ext/transport/chttp2/transport/hpack_encoder.h
+++ b/src/core/ext/transport/chttp2/transport/hpack_encoder.h
@@ -40,6 +40,7 @@
 #include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/transport/metadata.h"
 #include "src/core/lib/transport/metadata_batch.h"
+#include "src/core/lib/transport/transport.h"
 
 #define GRPC_CHTTP2_HPACKC_NUM_FILTERS 256
 #define GRPC_CHTTP2_HPACKC_NUM_VALUES 256
@@ -90,6 +91,7 @@ void grpc_chttp2_hpack_compressor_set_max_usable_size(
 
 void grpc_chttp2_encode_header(grpc_chttp2_hpack_compressor *c, uint32_t id,
                                grpc_metadata_batch *metadata, int is_eof,
+                               grpc_transport_one_way_stats *stats,
                                gpr_slice_buffer *outbuf);
 
 #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_ENCODER_H */
diff --git a/src/core/ext/transport/chttp2/transport/hpack_parser.c b/src/core/ext/transport/chttp2/transport/hpack_parser.c
index ec3387efb8dcb9b23f003add0288c0f6a1b133d3..259452fa4220cc7c39d3de6776266807b531fc74 100644
--- a/src/core/ext/transport/chttp2/transport/hpack_parser.c
+++ b/src/core/ext/transport/chttp2/transport/hpack_parser.c
@@ -1426,6 +1426,9 @@ grpc_chttp2_parse_error grpc_chttp2_header_parser_parse(
     grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last) {
   grpc_chttp2_hpack_parser *parser = hpack_parser;
   GPR_TIMER_BEGIN("grpc_chttp2_hpack_parser_parse", 0);
+  if (stream_parsing != NULL) {
+    stream_parsing->stats.incoming.header_bytes += GPR_SLICE_LENGTH(slice);
+  }
   if (!grpc_chttp2_hpack_parser_parse(parser, GPR_SLICE_START_PTR(slice),
                                       GPR_SLICE_END_PTR(slice))) {
     GPR_TIMER_END("grpc_chttp2_hpack_parser_parse", 0);
diff --git a/src/core/ext/transport/chttp2/transport/internal.h b/src/core/ext/transport/chttp2/transport/internal.h
index 2fae6536232a00c25218b433bd47a4f2151a1ee0..2c3c7a3820b325b04571615e7560d22357e3a3c7 100644
--- a/src/core/ext/transport/chttp2/transport/internal.h
+++ b/src/core/ext/transport/chttp2/transport/internal.h
@@ -394,6 +394,9 @@ typedef struct {
   grpc_metadata_batch *recv_trailing_metadata;
   grpc_closure *recv_trailing_metadata_finished;
 
+  grpc_transport_stream_stats *collecting_stats;
+  grpc_transport_stream_stats stats;
+
   /** when the application requests writes be closed, the write_closed is
       'queued'; when the close is flow controlled into the send path, we are
       'sending' it; when the write has been performed it is 'sent' */
@@ -435,6 +438,8 @@ typedef struct {
   gpr_slice fetching_slice;
   size_t stream_fetched;
   grpc_closure finished_fetch;
+  /** stats gathered during the write */
+  grpc_transport_one_way_stats stats;
 } grpc_chttp2_stream_writing;
 
 struct grpc_chttp2_stream_parsing {
@@ -460,6 +465,8 @@ struct grpc_chttp2_stream_parsing {
   int64_t outgoing_window;
   /** number of bytes received - reset at end of parse thread execution */
   int64_t received_bytes;
+  /** stats gathered during the parse */
+  grpc_transport_stream_stats stats;
 
   /** incoming metadata */
   grpc_chttp2_incoming_metadata_buffer metadata_buffer[2];
@@ -635,6 +642,7 @@ void grpc_chttp2_parsing_become_skip_parser(
     grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing);
 
 void grpc_chttp2_complete_closure_step(grpc_exec_ctx *exec_ctx,
+                                       grpc_chttp2_stream_global *stream_global,
                                        grpc_closure **pclosure, int success);
 
 #define GRPC_CHTTP2_CLIENT_CONNECT_STRING "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
diff --git a/src/core/ext/transport/chttp2/transport/parsing.c b/src/core/ext/transport/chttp2/transport/parsing.c
index a9f043cee3988f3c7dd67134ce006c7105094ac6..1e815e096b458f8688bf436e73ffd09d1e258548 100644
--- a/src/core/ext/transport/chttp2/transport/parsing.c
+++ b/src/core/ext/transport/chttp2/transport/parsing.c
@@ -171,6 +171,9 @@ void grpc_chttp2_publish_reads(
       grpc_chttp2_list_add_check_read_ops(transport_global, stream_global);
     }
 
+    /* flush stats to global stream state */
+    grpc_transport_move_stats(&stream_parsing->stats, &stream_global->stats);
+
     /* update outgoing flow control window */
     was_zero = stream_global->outgoing_window <= 0;
     GRPC_CHTTP2_FLOW_MOVE_STREAM("parsed", transport_global, stream_global,
@@ -544,8 +547,13 @@ static int init_data_frame_parser(
       grpc_chttp2_parsing_lookup_stream(transport_parsing,
                                         transport_parsing->incoming_stream_id);
   grpc_chttp2_parse_error err = GRPC_CHTTP2_PARSE_OK;
-  if (!stream_parsing || stream_parsing->received_close)
+  if (stream_parsing == NULL) {
+    return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
+  }
+  stream_parsing->stats.incoming.framing_bytes += 9;
+  if (stream_parsing->received_close) {
     return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
+  }
   if (err == GRPC_CHTTP2_PARSE_OK) {
     err = update_incoming_window(exec_ctx, transport_parsing, stream_parsing);
   }
@@ -566,7 +574,8 @@ static int init_data_frame_parser(
       gpr_slice_buffer_add(
           &transport_parsing->qbuf,
           grpc_chttp2_rst_stream_create(transport_parsing->incoming_stream_id,
-                                        GRPC_CHTTP2_PROTOCOL_ERROR));
+                                        GRPC_CHTTP2_PROTOCOL_ERROR,
+                                        &stream_parsing->stats.outgoing));
       return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
     case GRPC_CHTTP2_CONNECTION_ERROR:
       return 0;
@@ -717,6 +726,7 @@ static int init_header_frame_parser(
     transport_parsing->incoming_stream = stream_parsing;
   }
   GPR_ASSERT(stream_parsing != NULL && (via_accept == 0 || via_accept == 1));
+  stream_parsing->stats.incoming.framing_bytes += 9;
   if (stream_parsing->received_close) {
     gpr_log(GPR_ERROR, "skipping already closed grpc_chttp2_stream header");
     transport_parsing->incoming_stream = NULL;
@@ -752,9 +762,14 @@ static int init_window_update_frame_parser(
                                        &transport_parsing->simple.window_update,
                                        transport_parsing->incoming_frame_size,
                                        transport_parsing->incoming_frame_flags);
-  if (transport_parsing->incoming_stream_id) {
-    transport_parsing->incoming_stream = grpc_chttp2_parsing_lookup_stream(
-        transport_parsing, transport_parsing->incoming_stream_id);
+  if (transport_parsing->incoming_stream_id != 0) {
+    grpc_chttp2_stream_parsing *stream_parsing =
+        transport_parsing->incoming_stream = grpc_chttp2_parsing_lookup_stream(
+            transport_parsing, transport_parsing->incoming_stream_id);
+    if (stream_parsing == NULL) {
+      return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
+    }
+    stream_parsing->stats.incoming.framing_bytes += 9;
   }
   transport_parsing->parser = grpc_chttp2_window_update_parser_parse;
   transport_parsing->parser_data = &transport_parsing->simple.window_update;
@@ -778,11 +793,13 @@ static int init_rst_stream_parser(
                                        &transport_parsing->simple.rst_stream,
                                        transport_parsing->incoming_frame_size,
                                        transport_parsing->incoming_frame_flags);
-  transport_parsing->incoming_stream = grpc_chttp2_parsing_lookup_stream(
-      transport_parsing, transport_parsing->incoming_stream_id);
+  grpc_chttp2_stream_parsing *stream_parsing =
+      transport_parsing->incoming_stream = grpc_chttp2_parsing_lookup_stream(
+          transport_parsing, transport_parsing->incoming_stream_id);
   if (!transport_parsing->incoming_stream) {
     return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
   }
+  stream_parsing->stats.incoming.framing_bytes += 9;
   transport_parsing->parser = grpc_chttp2_rst_stream_parser_parse;
   transport_parsing->parser_data = &transport_parsing->simple.rst_stream;
   return ok;
@@ -856,7 +873,8 @@ static int parse_frame_slice(grpc_exec_ctx *exec_ctx,
         gpr_slice_buffer_add(
             &transport_parsing->qbuf,
             grpc_chttp2_rst_stream_create(transport_parsing->incoming_stream_id,
-                                          GRPC_CHTTP2_PROTOCOL_ERROR));
+                                          GRPC_CHTTP2_PROTOCOL_ERROR,
+                                          &stream_parsing->stats.outgoing));
       }
       return 1;
     case GRPC_CHTTP2_CONNECTION_ERROR:
diff --git a/src/core/ext/transport/chttp2/transport/writing.c b/src/core/ext/transport/chttp2/transport/writing.c
index 8d5886f2255fb08b20f85b497d1f21d151a6b285..6bb188f1da7384f282adec8b6490dda4f71b6d10 100644
--- a/src/core/ext/transport/chttp2/transport/writing.c
+++ b/src/core/ext/transport/chttp2/transport/writing.c
@@ -161,8 +161,10 @@ int grpc_chttp2_unlocking_check_writes(
         transport_global->announce_incoming_window, UINT32_MAX);
     GRPC_CHTTP2_FLOW_DEBIT_TRANSPORT("write", transport_global,
                                      announce_incoming_window, announced);
-    gpr_slice_buffer_add(&transport_writing->outbuf,
-                         grpc_chttp2_window_update_create(0, announced));
+    grpc_transport_one_way_stats throwaway_stats;
+    gpr_slice_buffer_add(
+        &transport_writing->outbuf,
+        grpc_chttp2_window_update_create(0, announced, &throwaway_stats));
   }
 
   GPR_TIMER_END("grpc_chttp2_unlocking_check_writes", 0);
@@ -205,7 +207,8 @@ static void finalize_outbuf(grpc_exec_ctx *exec_ctx,
     if (stream_writing->send_initial_metadata != NULL) {
       grpc_chttp2_encode_header(
           &transport_writing->hpack_compressor, stream_writing->id,
-          stream_writing->send_initial_metadata, 0, &transport_writing->outbuf);
+          stream_writing->send_initial_metadata, 0, &stream_writing->stats,
+          &transport_writing->outbuf);
       stream_writing->send_initial_metadata = NULL;
       stream_writing->sent_initial_metadata = 1;
     }
@@ -216,7 +219,8 @@ static void finalize_outbuf(grpc_exec_ctx *exec_ctx,
       gpr_slice_buffer_add(
           &transport_writing->outbuf,
           grpc_chttp2_window_update_create(stream_writing->id,
-                                           stream_writing->announce_window));
+                                           stream_writing->announce_window,
+                                           &stream_writing->stats));
       GRPC_CHTTP2_FLOW_DEBIT_STREAM("write", transport_writing, stream_writing,
                                     announce_window, announce);
       stream_writing->announce_window = 0;
@@ -255,7 +259,8 @@ static void finalize_outbuf(grpc_exec_ctx *exec_ctx,
                                 stream_writing->send_trailing_metadata);
         grpc_chttp2_encode_data(
             stream_writing->id, &stream_writing->flow_controlled_buffer,
-            send_bytes, is_last_frame, &transport_writing->outbuf);
+            send_bytes, is_last_frame, &stream_writing->stats,
+            &transport_writing->outbuf);
         GRPC_CHTTP2_FLOW_DEBIT_STREAM("write", transport_writing,
                                       stream_writing, outgoing_window,
                                       send_bytes);
@@ -281,19 +286,20 @@ static void finalize_outbuf(grpc_exec_ctx *exec_ctx,
         stream_writing->send_trailing_metadata != NULL) {
       if (grpc_metadata_batch_is_empty(
               stream_writing->send_trailing_metadata)) {
-        grpc_chttp2_encode_data(stream_writing->id,
-                                &stream_writing->flow_controlled_buffer, 0, 1,
-                                &transport_writing->outbuf);
+        grpc_chttp2_encode_data(
+            stream_writing->id, &stream_writing->flow_controlled_buffer, 0, 1,
+            &stream_writing->stats, &transport_writing->outbuf);
       } else {
-        grpc_chttp2_encode_header(&transport_writing->hpack_compressor,
-                                  stream_writing->id,
-                                  stream_writing->send_trailing_metadata, 1,
-                                  &transport_writing->outbuf);
+        grpc_chttp2_encode_header(
+            &transport_writing->hpack_compressor, stream_writing->id,
+            stream_writing->send_trailing_metadata, 1, &stream_writing->stats,
+            &transport_writing->outbuf);
       }
       if (!transport_writing->is_client && !stream_writing->read_closed) {
         gpr_slice_buffer_add(&transport_writing->outbuf,
                              grpc_chttp2_rst_stream_create(
-                                 stream_writing->id, GRPC_CHTTP2_NO_ERROR));
+                                 stream_writing->id, GRPC_CHTTP2_NO_ERROR,
+                                 &stream_writing->stats));
       }
       stream_writing->send_trailing_metadata = NULL;
       stream_writing->sent_trailing_metadata = 1;
@@ -328,17 +334,21 @@ void grpc_chttp2_cleanup_writing(
       transport_global, transport_writing, &stream_global, &stream_writing)) {
     if (stream_writing->sent_initial_metadata) {
       grpc_chttp2_complete_closure_step(
-          exec_ctx, &stream_global->send_initial_metadata_finished, 1);
+          exec_ctx, stream_global,
+          &stream_global->send_initial_metadata_finished, 1);
     }
+    grpc_transport_move_one_way_stats(&stream_writing->stats,
+                                      &stream_global->stats.outgoing);
     if (stream_writing->sent_message) {
       GPR_ASSERT(stream_writing->send_message == NULL);
       grpc_chttp2_complete_closure_step(
-          exec_ctx, &stream_global->send_message_finished, 1);
+          exec_ctx, stream_global, &stream_global->send_message_finished, 1);
       stream_writing->sent_message = 0;
     }
     if (stream_writing->sent_trailing_metadata) {
       grpc_chttp2_complete_closure_step(
-          exec_ctx, &stream_global->send_trailing_metadata_finished, 1);
+          exec_ctx, stream_global,
+          &stream_global->send_trailing_metadata_finished, 1);
     }
     if (stream_writing->sent_trailing_metadata) {
       grpc_chttp2_mark_stream_closed(exec_ctx, transport_global, stream_global,
diff --git a/src/core/lib/channel/http_client_filter.c b/src/core/lib/channel/http_client_filter.c
index 7dbac38414607673378613b515bfa3a6a436e562..b4e58b7f293343133a3953987ae55d138108264c 100644
--- a/src/core/lib/channel/http_client_filter.c
+++ b/src/core/lib/channel/http_client_filter.c
@@ -112,7 +112,9 @@ static void hc_mutate_op(grpc_call_element *elem,
     /* Send : prefixed headers, which have to be before any application
        layer headers. */
     grpc_metadata_batch_add_head(op->send_initial_metadata, &calld->method,
-                                 GRPC_MDELEM_METHOD_POST);
+                                 op->send_idempotent_request
+                                     ? GRPC_MDELEM_METHOD_PUT
+                                     : GRPC_MDELEM_METHOD_POST);
     grpc_metadata_batch_add_head(op->send_initial_metadata, &calld->scheme,
                                  channeld->static_scheme);
     grpc_metadata_batch_add_tail(op->send_initial_metadata, &calld->te_trailers,
diff --git a/src/core/lib/channel/http_server_filter.c b/src/core/lib/channel/http_server_filter.c
index df99b77ab3153aa53c346748509a805f839f1716..db1a3d501047c7b1ecf88363f3a416b05bba6eb9 100644
--- a/src/core/lib/channel/http_server_filter.c
+++ b/src/core/lib/channel/http_server_filter.c
@@ -41,7 +41,7 @@
 
 typedef struct call_data {
   uint8_t seen_path;
-  uint8_t seen_post;
+  uint8_t seen_method;
   uint8_t sent_status;
   uint8_t seen_scheme;
   uint8_t seen_te_trailers;
@@ -50,6 +50,7 @@ typedef struct call_data {
   grpc_linked_mdelem content_type;
 
   grpc_metadata_batch *recv_initial_metadata;
+  bool *recv_idempotent_request;
   /** Closure to call when finished with the hs_on_recv hook */
   grpc_closure *on_done_recv;
   /** Receive closures are chained: we inject this closure as the on_done_recv
@@ -72,11 +73,16 @@ static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) {
 
   /* Check if it is one of the headers we care about. */
   if (md == GRPC_MDELEM_TE_TRAILERS || md == GRPC_MDELEM_METHOD_POST ||
-      md == GRPC_MDELEM_SCHEME_HTTP || md == GRPC_MDELEM_SCHEME_HTTPS ||
+      md == GRPC_MDELEM_METHOD_PUT || md == GRPC_MDELEM_SCHEME_HTTP ||
+      md == GRPC_MDELEM_SCHEME_HTTPS ||
       md == GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC) {
     /* swallow it */
     if (md == GRPC_MDELEM_METHOD_POST) {
-      calld->seen_post = 1;
+      calld->seen_method = 1;
+      *calld->recv_idempotent_request = false;
+    } else if (md == GRPC_MDELEM_METHOD_PUT) {
+      calld->seen_method = 1;
+      *calld->recv_idempotent_request = true;
     } else if (md->key == GRPC_MDSTR_SCHEME) {
       calld->seen_scheme = 1;
     } else if (md == GRPC_MDELEM_TE_TRAILERS) {
@@ -142,7 +148,7 @@ static void hs_on_recv(grpc_exec_ctx *exec_ctx, void *user_data, bool success) {
     /* Have we seen the required http2 transport headers?
        (:method, :scheme, content-type, with :path and :authority covered
        at the channel level right now) */
-    if (calld->seen_post && calld->seen_scheme && calld->seen_te_trailers &&
+    if (calld->seen_method && calld->seen_scheme && calld->seen_te_trailers &&
         calld->seen_path && calld->seen_authority) {
       /* do nothing */
     } else {
@@ -152,7 +158,7 @@ static void hs_on_recv(grpc_exec_ctx *exec_ctx, void *user_data, bool success) {
       if (!calld->seen_authority) {
         gpr_log(GPR_ERROR, "Missing :authority header");
       }
-      if (!calld->seen_post) {
+      if (!calld->seen_method) {
         gpr_log(GPR_ERROR, "Missing :method header");
       }
       if (!calld->seen_scheme) {
@@ -185,7 +191,9 @@ static void hs_mutate_op(grpc_call_element *elem,
 
   if (op->recv_initial_metadata) {
     /* substitute our callback for the higher callback */
+    GPR_ASSERT(op->recv_idempotent_request != NULL);
     calld->recv_initial_metadata = op->recv_initial_metadata;
+    calld->recv_idempotent_request = op->recv_idempotent_request;
     calld->on_done_recv = op->recv_initial_metadata_ready;
     op->recv_initial_metadata_ready = &calld->hs_on_recv;
   }
diff --git a/src/core/lib/client_config/lb_policy_registry.c b/src/core/lib/client_config/lb_policy_registry.c
index f703e630a086a48f6bf9236838438f0999faed15..d1dc502b9ab8c6cf9f39db07f6253a9c4787f736 100644
--- a/src/core/lib/client_config/lb_policy_registry.c
+++ b/src/core/lib/client_config/lb_policy_registry.c
@@ -40,12 +40,7 @@
 static grpc_lb_policy_factory *g_all_of_the_lb_policies[MAX_POLICIES];
 static int g_number_of_lb_policies = 0;
 
-static grpc_lb_policy_factory *g_default_lb_policy_factory;
-
-void grpc_lb_policy_registry_init(grpc_lb_policy_factory *default_factory) {
-  g_number_of_lb_policies = 0;
-  g_default_lb_policy_factory = default_factory;
-}
+void grpc_lb_policy_registry_init(void) { g_number_of_lb_policies = 0; }
 
 void grpc_lb_policy_registry_shutdown(void) {
   int i;
diff --git a/src/core/lib/client_config/lb_policy_registry.h b/src/core/lib/client_config/lb_policy_registry.h
index 789854bd2059a0f0709c381288309911f8c2217f..1ecf7fe39f6dacbdb3696d623a97508f7828ecc9 100644
--- a/src/core/lib/client_config/lb_policy_registry.h
+++ b/src/core/lib/client_config/lb_policy_registry.h
@@ -39,7 +39,7 @@
 
 /** Initialize the registry and set \a default_factory as the factory to be
  * returned when no name is provided in a lookup */
-void grpc_lb_policy_registry_init(grpc_lb_policy_factory *default_factory);
+void grpc_lb_policy_registry_init(void);
 void grpc_lb_policy_registry_shutdown(void);
 
 /** Register a LB policy factory. */
diff --git a/src/core/lib/iomgr/unix_sockets_posix_noop.c b/src/core/lib/iomgr/unix_sockets_posix_noop.c
index 06f6ee05e719c17a8306d43e5c0e35c3c2a82220..43e006e15e965ef58609184cbe839e5bc09ed839 100644
--- a/src/core/lib/iomgr/unix_sockets_posix_noop.c
+++ b/src/core/lib/iomgr/unix_sockets_posix_noop.c
@@ -35,7 +35,12 @@
 
 #ifndef GPR_HAVE_UNIX_SOCKET
 
-void grpc_create_socketpair_if_unix(int sv[2]) {}
+void grpc_create_socketpair_if_unix(int sv[2]) {
+  // TODO: Either implement this for the non-Unix socket case or make
+  // sure that it is never called in any such case. Until then, leave an
+  // assertion to notify if this gets called inadvertently
+  GPR_ASSERT(0);
+}
 
 grpc_resolved_addresses *grpc_resolve_unix_domain_address(const char *name) {
   return NULL;
diff --git a/src/core/lib/surface/call.c b/src/core/lib/surface/call.c
index d63a4a7401ed77e92e079dbfdaa5142f813e311f..77ad410b5027ce338c197d29a1efba4acb2f23bb 100644
--- a/src/core/lib/surface/call.c
+++ b/src/core/lib/surface/call.c
@@ -174,6 +174,9 @@ struct grpc_call {
   /* Received call statuses from various sources */
   received_status status[STATUS_SOURCE_COUNT];
 
+  /* Call stats: only valid after trailing metadata received */
+  grpc_transport_stream_stats stats;
+
   /* Compression algorithm for the call */
   grpc_compression_algorithm compression_algorithm;
   /* Supported encodings (compression algorithms), a bitset */
@@ -909,7 +912,7 @@ static void set_cancelled_value(grpc_status_code status, void *dest) {
   *(int *)dest = (status != GRPC_STATUS_OK);
 }
 
-static int are_write_flags_valid(uint32_t flags) {
+static bool are_write_flags_valid(uint32_t flags) {
   /* check that only bits in GRPC_WRITE_(INTERNAL?)_USED_MASK are set */
   const uint32_t allowed_write_positions =
       (GRPC_WRITE_USED_MASK | GRPC_WRITE_INTERNAL_USED_MASK);
@@ -917,6 +920,15 @@ static int are_write_flags_valid(uint32_t flags) {
   return !(flags & invalid_positions);
 }
 
+static bool are_initial_metadata_flags_valid(uint32_t flags, bool is_client) {
+  /* check that only bits in GRPC_WRITE_(INTERNAL?)_USED_MASK are set */
+  uint32_t invalid_positions = ~GRPC_INITIAL_METADATA_USED_MASK;
+  if (!is_client) {
+    invalid_positions |= GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST;
+  }
+  return !(flags & invalid_positions);
+}
+
 static batch_control *allocate_batch_control(grpc_call *call) {
   size_t i;
   for (i = 0; i < MAX_CONCURRENT_BATCHES; i++) {
@@ -1196,7 +1208,7 @@ static grpc_call_error call_start_batch(grpc_exec_ctx *exec_ctx,
     switch (op->op) {
       case GRPC_OP_SEND_INITIAL_METADATA:
         /* Flag validation: currently allow no flags */
-        if (op->flags != 0) {
+        if (!are_initial_metadata_flags_valid(op->flags, call->is_client)) {
           error = GRPC_CALL_ERROR_INVALID_FLAGS;
           goto done_with_error;
         }
@@ -1220,6 +1232,8 @@ static grpc_call_error call_start_batch(grpc_exec_ctx *exec_ctx,
         call->metadata_batch[0][0].deadline = call->send_deadline;
         stream_op.send_initial_metadata =
             &call->metadata_batch[0 /* is_receiving */][0 /* is_trailing */];
+        stream_op.send_idempotent_request =
+            (op->flags & GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) != 0;
         break;
       case GRPC_OP_SEND_MESSAGE:
         if (!are_write_flags_valid(op->flags)) {
@@ -1371,6 +1385,7 @@ static grpc_call_error call_start_batch(grpc_exec_ctx *exec_ctx,
         bctl->recv_final_op = 1;
         stream_op.recv_trailing_metadata =
             &call->metadata_batch[1 /* is_receiving */][1 /* is_trailing */];
+        stream_op.collect_stats = &call->stats;
         break;
       case GRPC_OP_RECV_CLOSE_ON_SERVER:
         /* Flag validation: currently allow no flags */
@@ -1392,6 +1407,7 @@ static grpc_call_error call_start_batch(grpc_exec_ctx *exec_ctx,
         bctl->recv_final_op = 1;
         stream_op.recv_trailing_metadata =
             &call->metadata_batch[1 /* is_receiving */][1 /* is_trailing */];
+        stream_op.collect_stats = &call->stats;
         break;
     }
   }
diff --git a/src/core/lib/surface/init.c b/src/core/lib/surface/init.c
index dbfc8a9336e5f4261d8ae947b07d642f87d231a9..3ccc21fb31b87b9c6a646b742971259729bab41b 100644
--- a/src/core/lib/surface/init.c
+++ b/src/core/lib/surface/init.c
@@ -48,8 +48,6 @@
 #include "src/core/lib/channel/connected_channel.h"
 #include "src/core/lib/channel/http_client_filter.h"
 #include "src/core/lib/channel/http_server_filter.h"
-#include "src/core/lib/client_config/lb_policies/pick_first.h"
-#include "src/core/lib/client_config/lb_policies/round_robin.h"
 #include "src/core/lib/client_config/lb_policy_registry.h"
 #include "src/core/lib/client_config/resolver_registry.h"
 #include "src/core/lib/client_config/resolvers/dns_resolver.h"
@@ -75,6 +73,9 @@
 #define GRPC_DEFAULT_NAME_PREFIX "dns:///"
 #endif
 
+/* (generated) built in registry of plugins */
+extern void grpc_register_built_in_plugins(void);
+
 #define MAX_PLUGINS 128
 
 static gpr_once g_basic_init = GPR_ONCE_INIT;
@@ -83,6 +84,7 @@ static int g_initializations;
 
 static void do_basic_init(void) {
   gpr_mu_init(&g_init_mu);
+  grpc_register_built_in_plugins();
   /* TODO(ctiller): ideally remove this strict linkage */
   grpc_register_plugin(census_grpc_plugin_init, census_grpc_plugin_destroy);
   g_initializations = 0;
@@ -165,14 +167,12 @@ void grpc_init(void) {
     gpr_time_init();
     grpc_mdctx_global_init();
     grpc_channel_init_init();
-    grpc_lb_policy_registry_init(grpc_pick_first_lb_factory_create());
-    grpc_register_lb_policy(grpc_pick_first_lb_factory_create());
-    grpc_register_lb_policy(grpc_round_robin_lb_factory_create());
+    grpc_lb_policy_registry_init();
     grpc_resolver_registry_init(GRPC_DEFAULT_NAME_PREFIX);
     grpc_register_resolver_type(grpc_dns_resolver_factory_create());
     grpc_register_resolver_type(grpc_ipv4_resolver_factory_create());
     grpc_register_resolver_type(grpc_ipv6_resolver_factory_create());
-#ifdef GPR_POSIX_SOCKET
+#ifdef GPR_HAVE_UNIX_SOCKET
     grpc_register_resolver_type(grpc_unix_resolver_factory_create());
 #endif
     grpc_register_tracer("api", &grpc_api_trace);
diff --git a/src/core/lib/surface/server.c b/src/core/lib/surface/server.c
index 080734e9d59fd1bd4019ef76e19326896a4895d1..55e5e49e11735a46c9fb2e68b3256b54f86d1071 100644
--- a/src/core/lib/surface/server.c
+++ b/src/core/lib/surface/server.c
@@ -100,6 +100,7 @@ typedef struct requested_call {
 
 typedef struct channel_registered_method {
   registered_method *server_registered_method;
+  uint32_t flags;
   grpc_mdstr *method;
   grpc_mdstr *host;
 } channel_registered_method;
@@ -152,6 +153,7 @@ struct call_data {
   grpc_completion_queue *cq_new;
 
   grpc_metadata_batch *recv_initial_metadata;
+  bool recv_idempotent_request;
   grpc_metadata_array initial_metadata;
 
   grpc_closure got_initial_metadata;
@@ -171,6 +173,7 @@ struct request_matcher {
 struct registered_method {
   char *method;
   char *host;
+  uint32_t flags;
   request_matcher request_matcher;
   registered_method *next;
 };
@@ -468,6 +471,9 @@ static void start_new_rpc(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
       if (!rm) break;
       if (rm->host != calld->host) continue;
       if (rm->method != calld->path) continue;
+      if ((rm->flags & GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) &&
+          !calld->recv_idempotent_request)
+        continue;
       finish_start_new_rpc(exec_ctx, server, elem,
                            &rm->server_registered_method->request_matcher);
       return;
@@ -480,6 +486,9 @@ static void start_new_rpc(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
       if (!rm) break;
       if (rm->host != NULL) continue;
       if (rm->method != calld->path) continue;
+      if ((rm->flags & GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) &&
+          !calld->recv_idempotent_request)
+        continue;
       finish_start_new_rpc(exec_ctx, server, elem,
                            &rm->server_registered_method->request_matcher);
       return;
@@ -598,9 +607,11 @@ static void server_mutate_op(grpc_call_element *elem,
   call_data *calld = elem->call_data;
 
   if (op->recv_initial_metadata != NULL) {
+    GPR_ASSERT(op->recv_idempotent_request == NULL);
     calld->recv_initial_metadata = op->recv_initial_metadata;
     calld->on_done_recv_initial_metadata = op->recv_initial_metadata_ready;
     op->recv_initial_metadata_ready = &calld->server_on_recv_initial_metadata;
+    op->recv_idempotent_request = &calld->recv_idempotent_request;
   }
 }
 
@@ -830,10 +841,12 @@ static int streq(const char *a, const char *b) {
 }
 
 void *grpc_server_register_method(grpc_server *server, const char *method,
-                                  const char *host) {
+                                  const char *host, uint32_t flags) {
   registered_method *m;
-  GRPC_API_TRACE("grpc_server_register_method(server=%p, method=%s, host=%s)",
-                 3, (server, method, host));
+  GRPC_API_TRACE(
+      "grpc_server_register_method(server=%p, method=%s, host=%s, "
+      "flags=0x%08x)",
+      4, (server, method, host, flags));
   if (!method) {
     gpr_log(GPR_ERROR,
             "grpc_server_register_method method string cannot be NULL");
@@ -846,12 +859,18 @@ void *grpc_server_register_method(grpc_server *server, const char *method,
       return NULL;
     }
   }
+  if ((flags & ~GRPC_INITIAL_METADATA_USED_MASK) != 0) {
+    gpr_log(GPR_ERROR, "grpc_server_register_method invalid flags 0x%08x",
+            flags);
+    return NULL;
+  }
   m = gpr_malloc(sizeof(registered_method));
   memset(m, 0, sizeof(*m));
   request_matcher_init(&m->request_matcher, server->max_requested_calls);
   m->method = gpr_strdup(method);
   m->host = gpr_strdup(host);
   m->next = server->registered_methods;
+  m->flags = flags;
   server->registered_methods = m;
   return m;
 }
@@ -930,6 +949,7 @@ void grpc_server_setup_transport(grpc_exec_ctx *exec_ctx, grpc_server *s,
       if (probes > max_probes) max_probes = probes;
       crm = &chand->registered_methods[(hash + probes) % slots];
       crm->server_registered_method = rm;
+      crm->flags = rm->flags;
       crm->host = host;
       crm->method = method;
     }
@@ -1247,6 +1267,10 @@ static void begin_call(grpc_exec_ctx *exec_ctx, grpc_server *server,
       cpstr(&rc->data.batch.details->method,
             &rc->data.batch.details->method_capacity, calld->path);
       rc->data.batch.details->deadline = calld->deadline;
+      rc->data.batch.details->flags =
+          0 | (calld->recv_idempotent_request
+                   ? GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST
+                   : 0);
       break;
     case REGISTERED_CALL:
       *rc->data.registered.deadline = calld->deadline;
diff --git a/src/core/lib/transport/static_metadata.c b/src/core/lib/transport/static_metadata.c
index eda277b3dc99d165e53d4afdeeaf3d33bd0a460e..bde1fafc8836e67594d9cb6b1f6aa7b918c78a48 100644
--- a/src/core/lib/transport/static_metadata.c
+++ b/src/core/lib/transport/static_metadata.c
@@ -1,5 +1,4 @@
 /*
- *
  * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
@@ -28,19 +27,16 @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
  */
 
 /*
  * WARNING: Auto-generated code.
  *
  * To make changes to this file, change
- * tools/codegen/core/gen_static_metadata.py,
- * and then re-run it.
+ * tools/codegen/core/gen_static_metadata.py, and then re-run it.
  *
  * See metadata.h for an explanation of the interface here, and metadata.c for
- * an
- * explanation of what's going on.
+ * an explanation of what's going on.
  */
 
 #include "src/core/lib/transport/static_metadata.h"
@@ -52,7 +48,7 @@ uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 4, 8, 6, 2, 4, 8, 6, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 
 const uint8_t grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT * 2] =
     {11, 35, 10, 35, 12, 35, 12, 49, 13, 35, 14, 35, 15, 35, 16, 35, 17, 35,
@@ -60,10 +56,10 @@ const uint8_t grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT * 2] =
      30, 18, 30, 35, 31, 35, 32, 35, 36, 35, 37, 35, 38, 35, 39, 35, 42, 33,
      42, 34, 42, 48, 42, 53, 42, 54, 42, 55, 42, 56, 43, 33, 43, 48, 43, 53,
      46, 0,  46, 1,  46, 2,  50, 35, 57, 35, 58, 35, 59, 35, 60, 35, 61, 35,
-     62, 35, 63, 35, 64, 35, 65, 35, 66, 40, 66, 68, 67, 78, 67, 79, 69, 35,
-     70, 35, 71, 35, 72, 35, 73, 35, 74, 35, 75, 41, 75, 51, 75, 52, 76, 35,
-     77, 35, 80, 3,  80, 4,  80, 5,  80, 6,  80, 7,  80, 8,  80, 9,  81, 35,
-     82, 83, 84, 35, 85, 35, 86, 35, 87, 35, 88, 35};
+     62, 35, 63, 35, 64, 35, 65, 35, 66, 40, 66, 68, 66, 71, 67, 79, 67, 80,
+     69, 35, 70, 35, 72, 35, 73, 35, 74, 35, 75, 35, 76, 41, 76, 51, 76, 52,
+     77, 35, 78, 35, 81, 3,  81, 4,  81, 5,  81, 6,  81, 7,  81, 8,  81, 9,
+     82, 35, 83, 84, 85, 35, 86, 35, 87, 35, 88, 35, 89, 35};
 
 const char *const grpc_static_metadata_strings[GRPC_STATIC_MDSTR_COUNT] = {
     "0",
@@ -137,6 +133,7 @@ const char *const grpc_static_metadata_strings[GRPC_STATIC_MDSTR_COUNT] = {
     "POST",
     "proxy-authenticate",
     "proxy-authorization",
+    "PUT",
     "range",
     "referer",
     "refresh",
diff --git a/src/core/lib/transport/static_metadata.h b/src/core/lib/transport/static_metadata.h
index aff136a6d21f1655be4748322ca62776651649fb..a05553a8709b16fe194bfac67894fe7c41f579b1 100644
--- a/src/core/lib/transport/static_metadata.h
+++ b/src/core/lib/transport/static_metadata.h
@@ -1,5 +1,4 @@
 /*
- *
  * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
@@ -28,19 +27,16 @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
  */
 
 /*
  * WARNING: Auto-generated code.
  *
  * To make changes to this file, change
- * tools/codegen/core/gen_static_metadata.py,
- * and then re-run it.
+ * tools/codegen/core/gen_static_metadata.py, and then re-run it.
  *
  * See metadata.h for an explanation of the interface here, and metadata.c for
- * an
- * explanation of what's going on.
+ * an explanation of what's going on.
  */
 
 #ifndef GRPC_CORE_LIB_TRANSPORT_STATIC_METADATA_H
@@ -48,7 +44,7 @@
 
 #include "src/core/lib/transport/metadata.h"
 
-#define GRPC_STATIC_MDSTR_COUNT 89
+#define GRPC_STATIC_MDSTR_COUNT 90
 extern grpc_mdstr grpc_static_mdstr_table[GRPC_STATIC_MDSTR_COUNT];
 /* "0" */
 #define GRPC_MDSTR_0 (&grpc_static_mdstr_table[0])
@@ -193,44 +189,46 @@ extern grpc_mdstr grpc_static_mdstr_table[GRPC_STATIC_MDSTR_COUNT];
 #define GRPC_MDSTR_PROXY_AUTHENTICATE (&grpc_static_mdstr_table[69])
 /* "proxy-authorization" */
 #define GRPC_MDSTR_PROXY_AUTHORIZATION (&grpc_static_mdstr_table[70])
+/* "PUT" */
+#define GRPC_MDSTR_PUT (&grpc_static_mdstr_table[71])
 /* "range" */
-#define GRPC_MDSTR_RANGE (&grpc_static_mdstr_table[71])
+#define GRPC_MDSTR_RANGE (&grpc_static_mdstr_table[72])
 /* "referer" */
-#define GRPC_MDSTR_REFERER (&grpc_static_mdstr_table[72])
+#define GRPC_MDSTR_REFERER (&grpc_static_mdstr_table[73])
 /* "refresh" */
-#define GRPC_MDSTR_REFRESH (&grpc_static_mdstr_table[73])
+#define GRPC_MDSTR_REFRESH (&grpc_static_mdstr_table[74])
 /* "retry-after" */
-#define GRPC_MDSTR_RETRY_AFTER (&grpc_static_mdstr_table[74])
+#define GRPC_MDSTR_RETRY_AFTER (&grpc_static_mdstr_table[75])
 /* ":scheme" */
-#define GRPC_MDSTR_SCHEME (&grpc_static_mdstr_table[75])
+#define GRPC_MDSTR_SCHEME (&grpc_static_mdstr_table[76])
 /* "server" */
-#define GRPC_MDSTR_SERVER (&grpc_static_mdstr_table[76])
+#define GRPC_MDSTR_SERVER (&grpc_static_mdstr_table[77])
 /* "set-cookie" */
-#define GRPC_MDSTR_SET_COOKIE (&grpc_static_mdstr_table[77])
+#define GRPC_MDSTR_SET_COOKIE (&grpc_static_mdstr_table[78])
 /* "/" */
-#define GRPC_MDSTR_SLASH (&grpc_static_mdstr_table[78])
+#define GRPC_MDSTR_SLASH (&grpc_static_mdstr_table[79])
 /* "/index.html" */
-#define GRPC_MDSTR_SLASH_INDEX_DOT_HTML (&grpc_static_mdstr_table[79])
+#define GRPC_MDSTR_SLASH_INDEX_DOT_HTML (&grpc_static_mdstr_table[80])
 /* ":status" */
-#define GRPC_MDSTR_STATUS (&grpc_static_mdstr_table[80])
+#define GRPC_MDSTR_STATUS (&grpc_static_mdstr_table[81])
 /* "strict-transport-security" */
-#define GRPC_MDSTR_STRICT_TRANSPORT_SECURITY (&grpc_static_mdstr_table[81])
+#define GRPC_MDSTR_STRICT_TRANSPORT_SECURITY (&grpc_static_mdstr_table[82])
 /* "te" */
-#define GRPC_MDSTR_TE (&grpc_static_mdstr_table[82])
+#define GRPC_MDSTR_TE (&grpc_static_mdstr_table[83])
 /* "trailers" */
-#define GRPC_MDSTR_TRAILERS (&grpc_static_mdstr_table[83])
+#define GRPC_MDSTR_TRAILERS (&grpc_static_mdstr_table[84])
 /* "transfer-encoding" */
-#define GRPC_MDSTR_TRANSFER_ENCODING (&grpc_static_mdstr_table[84])
+#define GRPC_MDSTR_TRANSFER_ENCODING (&grpc_static_mdstr_table[85])
 /* "user-agent" */
-#define GRPC_MDSTR_USER_AGENT (&grpc_static_mdstr_table[85])
+#define GRPC_MDSTR_USER_AGENT (&grpc_static_mdstr_table[86])
 /* "vary" */
-#define GRPC_MDSTR_VARY (&grpc_static_mdstr_table[86])
+#define GRPC_MDSTR_VARY (&grpc_static_mdstr_table[87])
 /* "via" */
-#define GRPC_MDSTR_VIA (&grpc_static_mdstr_table[87])
+#define GRPC_MDSTR_VIA (&grpc_static_mdstr_table[88])
 /* "www-authenticate" */
-#define GRPC_MDSTR_WWW_AUTHENTICATE (&grpc_static_mdstr_table[88])
+#define GRPC_MDSTR_WWW_AUTHENTICATE (&grpc_static_mdstr_table[89])
 
-#define GRPC_STATIC_MDELEM_COUNT 78
+#define GRPC_STATIC_MDELEM_COUNT 79
 extern grpc_mdelem grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT];
 extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];
 /* "accept-charset": "" */
@@ -343,61 +341,63 @@ extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];
 #define GRPC_MDELEM_METHOD_GET (&grpc_static_mdelem_table[49])
 /* ":method": "POST" */
 #define GRPC_MDELEM_METHOD_POST (&grpc_static_mdelem_table[50])
+/* ":method": "PUT" */
+#define GRPC_MDELEM_METHOD_PUT (&grpc_static_mdelem_table[51])
 /* ":path": "/" */
-#define GRPC_MDELEM_PATH_SLASH (&grpc_static_mdelem_table[51])
+#define GRPC_MDELEM_PATH_SLASH (&grpc_static_mdelem_table[52])
 /* ":path": "/index.html" */
-#define GRPC_MDELEM_PATH_SLASH_INDEX_DOT_HTML (&grpc_static_mdelem_table[52])
+#define GRPC_MDELEM_PATH_SLASH_INDEX_DOT_HTML (&grpc_static_mdelem_table[53])
 /* "proxy-authenticate": "" */
-#define GRPC_MDELEM_PROXY_AUTHENTICATE_EMPTY (&grpc_static_mdelem_table[53])
+#define GRPC_MDELEM_PROXY_AUTHENTICATE_EMPTY (&grpc_static_mdelem_table[54])
 /* "proxy-authorization": "" */
-#define GRPC_MDELEM_PROXY_AUTHORIZATION_EMPTY (&grpc_static_mdelem_table[54])
+#define GRPC_MDELEM_PROXY_AUTHORIZATION_EMPTY (&grpc_static_mdelem_table[55])
 /* "range": "" */
-#define GRPC_MDELEM_RANGE_EMPTY (&grpc_static_mdelem_table[55])
+#define GRPC_MDELEM_RANGE_EMPTY (&grpc_static_mdelem_table[56])
 /* "referer": "" */
-#define GRPC_MDELEM_REFERER_EMPTY (&grpc_static_mdelem_table[56])
+#define GRPC_MDELEM_REFERER_EMPTY (&grpc_static_mdelem_table[57])
 /* "refresh": "" */
-#define GRPC_MDELEM_REFRESH_EMPTY (&grpc_static_mdelem_table[57])
+#define GRPC_MDELEM_REFRESH_EMPTY (&grpc_static_mdelem_table[58])
 /* "retry-after": "" */
-#define GRPC_MDELEM_RETRY_AFTER_EMPTY (&grpc_static_mdelem_table[58])
+#define GRPC_MDELEM_RETRY_AFTER_EMPTY (&grpc_static_mdelem_table[59])
 /* ":scheme": "grpc" */
-#define GRPC_MDELEM_SCHEME_GRPC (&grpc_static_mdelem_table[59])
+#define GRPC_MDELEM_SCHEME_GRPC (&grpc_static_mdelem_table[60])
 /* ":scheme": "http" */
-#define GRPC_MDELEM_SCHEME_HTTP (&grpc_static_mdelem_table[60])
+#define GRPC_MDELEM_SCHEME_HTTP (&grpc_static_mdelem_table[61])
 /* ":scheme": "https" */
-#define GRPC_MDELEM_SCHEME_HTTPS (&grpc_static_mdelem_table[61])
+#define GRPC_MDELEM_SCHEME_HTTPS (&grpc_static_mdelem_table[62])
 /* "server": "" */
-#define GRPC_MDELEM_SERVER_EMPTY (&grpc_static_mdelem_table[62])
+#define GRPC_MDELEM_SERVER_EMPTY (&grpc_static_mdelem_table[63])
 /* "set-cookie": "" */
-#define GRPC_MDELEM_SET_COOKIE_EMPTY (&grpc_static_mdelem_table[63])
+#define GRPC_MDELEM_SET_COOKIE_EMPTY (&grpc_static_mdelem_table[64])
 /* ":status": "200" */
-#define GRPC_MDELEM_STATUS_200 (&grpc_static_mdelem_table[64])
+#define GRPC_MDELEM_STATUS_200 (&grpc_static_mdelem_table[65])
 /* ":status": "204" */
-#define GRPC_MDELEM_STATUS_204 (&grpc_static_mdelem_table[65])
+#define GRPC_MDELEM_STATUS_204 (&grpc_static_mdelem_table[66])
 /* ":status": "206" */
-#define GRPC_MDELEM_STATUS_206 (&grpc_static_mdelem_table[66])
+#define GRPC_MDELEM_STATUS_206 (&grpc_static_mdelem_table[67])
 /* ":status": "304" */
-#define GRPC_MDELEM_STATUS_304 (&grpc_static_mdelem_table[67])
+#define GRPC_MDELEM_STATUS_304 (&grpc_static_mdelem_table[68])
 /* ":status": "400" */
-#define GRPC_MDELEM_STATUS_400 (&grpc_static_mdelem_table[68])
+#define GRPC_MDELEM_STATUS_400 (&grpc_static_mdelem_table[69])
 /* ":status": "404" */
-#define GRPC_MDELEM_STATUS_404 (&grpc_static_mdelem_table[69])
+#define GRPC_MDELEM_STATUS_404 (&grpc_static_mdelem_table[70])
 /* ":status": "500" */
-#define GRPC_MDELEM_STATUS_500 (&grpc_static_mdelem_table[70])
+#define GRPC_MDELEM_STATUS_500 (&grpc_static_mdelem_table[71])
 /* "strict-transport-security": "" */
 #define GRPC_MDELEM_STRICT_TRANSPORT_SECURITY_EMPTY \
-  (&grpc_static_mdelem_table[71])
+  (&grpc_static_mdelem_table[72])
 /* "te": "trailers" */
-#define GRPC_MDELEM_TE_TRAILERS (&grpc_static_mdelem_table[72])
+#define GRPC_MDELEM_TE_TRAILERS (&grpc_static_mdelem_table[73])
 /* "transfer-encoding": "" */
-#define GRPC_MDELEM_TRANSFER_ENCODING_EMPTY (&grpc_static_mdelem_table[73])
+#define GRPC_MDELEM_TRANSFER_ENCODING_EMPTY (&grpc_static_mdelem_table[74])
 /* "user-agent": "" */
-#define GRPC_MDELEM_USER_AGENT_EMPTY (&grpc_static_mdelem_table[74])
+#define GRPC_MDELEM_USER_AGENT_EMPTY (&grpc_static_mdelem_table[75])
 /* "vary": "" */
-#define GRPC_MDELEM_VARY_EMPTY (&grpc_static_mdelem_table[75])
+#define GRPC_MDELEM_VARY_EMPTY (&grpc_static_mdelem_table[76])
 /* "via": "" */
-#define GRPC_MDELEM_VIA_EMPTY (&grpc_static_mdelem_table[76])
+#define GRPC_MDELEM_VIA_EMPTY (&grpc_static_mdelem_table[77])
 /* "www-authenticate": "" */
-#define GRPC_MDELEM_WWW_AUTHENTICATE_EMPTY (&grpc_static_mdelem_table[77])
+#define GRPC_MDELEM_WWW_AUTHENTICATE_EMPTY (&grpc_static_mdelem_table[78])
 
 extern const uint8_t
     grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT * 2];
diff --git a/src/core/lib/transport/transport.c b/src/core/lib/transport/transport.c
index 18256aae5e420190d244a7d594dc87c55d1a6ea2..411e4f140a76ba0a7c7b453f77efe537e82d2295 100644
--- a/src/core/lib/transport/transport.c
+++ b/src/core/lib/transport/transport.c
@@ -35,6 +35,7 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/atm.h>
 #include <grpc/support/log.h>
+#include <grpc/support/sync.h>
 #include "src/core/lib/transport/transport_impl.h"
 
 #ifdef GRPC_STREAM_REFCOUNT_DEBUG
@@ -76,6 +77,24 @@ void grpc_stream_ref_init(grpc_stream_refcount *refcount, int initial_refs,
   grpc_closure_init(&refcount->destroy, cb, cb_arg);
 }
 
+static void move64(uint64_t *from, uint64_t *to) {
+  *to += *from;
+  *from = 0;
+}
+
+void grpc_transport_move_one_way_stats(grpc_transport_one_way_stats *from,
+                                       grpc_transport_one_way_stats *to) {
+  move64(&from->framing_bytes, &to->framing_bytes);
+  move64(&from->data_bytes, &to->data_bytes);
+  move64(&from->header_bytes, &to->header_bytes);
+}
+
+void grpc_transport_move_stats(grpc_transport_stream_stats *from,
+                               grpc_transport_stream_stats *to) {
+  grpc_transport_move_one_way_stats(&from->incoming, &to->incoming);
+  grpc_transport_move_one_way_stats(&from->outgoing, &to->outgoing);
+}
+
 size_t grpc_transport_stream_size(grpc_transport *transport) {
   return transport->vtable->sizeof_stream;
 }
diff --git a/src/core/lib/transport/transport.h b/src/core/lib/transport/transport.h
index e98cfe9515cfceb57f2eb7a9dfecba86c9583cf3..6dd782c19eb04676ceaad8c02720488a2c694c11 100644
--- a/src/core/lib/transport/transport.h
+++ b/src/core/lib/transport/transport.h
@@ -78,11 +78,32 @@ void grpc_stream_unref(grpc_exec_ctx *exec_ctx, grpc_stream_refcount *refcount);
   grpc_stream_ref_init(rc, ir, cb, cb_arg)
 #endif
 
+typedef struct {
+  uint64_t framing_bytes;
+  uint64_t data_bytes;
+  uint64_t header_bytes;
+} grpc_transport_one_way_stats;
+
+typedef struct grpc_transport_stream_stats {
+  grpc_transport_one_way_stats incoming;
+  grpc_transport_one_way_stats outgoing;
+} grpc_transport_stream_stats;
+
+void grpc_transport_move_one_way_stats(grpc_transport_one_way_stats *from,
+                                       grpc_transport_one_way_stats *to);
+
+void grpc_transport_move_stats(grpc_transport_stream_stats *from,
+                               grpc_transport_stream_stats *to);
+
 /* Transport stream op: a set of operations to perform on a transport
    against a single stream */
 typedef struct grpc_transport_stream_op {
-  /** Send initial metadata to the peer, from the provided metadata batch. */
+  /** Send initial metadata to the peer, from the provided metadata batch.
+      idempotent_request MUST be set if this is non-null */
   grpc_metadata_batch *send_initial_metadata;
+  /** Iff send_initial_metadata != NULL, flags if this is an idempotent request
+      or not */
+  bool send_idempotent_request;
 
   /** Send trailing metadata to the peer, from the provided metadata batch. */
   grpc_metadata_batch *send_trailing_metadata;
@@ -92,6 +113,7 @@ typedef struct grpc_transport_stream_op {
 
   /** Receive initial metadata from the stream, into provided metadata batch. */
   grpc_metadata_batch *recv_initial_metadata;
+  bool *recv_idempotent_request;
   /** Should be enqueued when initial metadata is ready to be processed. */
   grpc_closure *recv_initial_metadata_ready;
 
@@ -104,6 +126,9 @@ typedef struct grpc_transport_stream_op {
    */
   grpc_metadata_batch *recv_trailing_metadata;
 
+  /** Collect any stats into provided buffer, zero internal stat counters */
+  grpc_transport_stream_stats *collect_stats;
+
   /** Should be enqueued when all requested operations (excluding recv_message
       and recv_initial_metadata which have their own closures) in a given batch
       have been completed. */
diff --git a/src/core/lib/client_config/lb_policies/pick_first.h b/src/core/plugin_registry/grpc_plugin_registry.c
similarity index 73%
rename from src/core/lib/client_config/lb_policies/pick_first.h
rename to src/core/plugin_registry/grpc_plugin_registry.c
index dba86ea7ad3960113aac1f256a7a1d6fe807869e..3e3c214c2219f8ba86c02519acf4f6efd2acc17c 100644
--- a/src/core/lib/client_config/lb_policies/pick_first.h
+++ b/src/core/plugin_registry/grpc_plugin_registry.c
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015-2016, Google Inc.
+ * Copyright 2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -31,13 +31,16 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_PICK_FIRST_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_PICK_FIRST_H
+#include <grpc/grpc.h>
 
-#include "src/core/lib/client_config/lb_policy_factory.h"
+extern void grpc_lb_policy_pick_first_init(void);
+extern void grpc_lb_policy_pick_first_shutdown(void);
+extern void grpc_lb_policy_round_robin_init(void);
+extern void grpc_lb_policy_round_robin_shutdown(void);
 
-/** Returns a load balancing factory for the pick first policy, which picks up
- * the first subchannel from \a subchannels to succesfully connect */
-grpc_lb_policy_factory *grpc_pick_first_lb_factory_create();
-
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_PICK_FIRST_H */
+void grpc_register_built_in_plugins(void) {
+  grpc_register_plugin(grpc_lb_policy_pick_first_init,
+                       grpc_lb_policy_pick_first_shutdown);
+  grpc_register_plugin(grpc_lb_policy_round_robin_init,
+                       grpc_lb_policy_round_robin_shutdown);
+}
diff --git a/src/core/lib/client_config/lb_policies/round_robin.h b/src/core/plugin_registry/grpc_unsecure_plugin_registry.c
similarity index 73%
rename from src/core/lib/client_config/lb_policies/round_robin.h
rename to src/core/plugin_registry/grpc_unsecure_plugin_registry.c
index 52db1caa0c20555c0b4ebac21cdf6202b83c1e6f..3e3c214c2219f8ba86c02519acf4f6efd2acc17c 100644
--- a/src/core/lib/client_config/lb_policies/round_robin.h
+++ b/src/core/plugin_registry/grpc_unsecure_plugin_registry.c
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015-2016, Google Inc.
+ * Copyright 2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -31,16 +31,16 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_ROUND_ROBIN_H
-#define GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_ROUND_ROBIN_H
+#include <grpc/grpc.h>
 
-#include "src/core/lib/client_config/lb_policy.h"
+extern void grpc_lb_policy_pick_first_init(void);
+extern void grpc_lb_policy_pick_first_shutdown(void);
+extern void grpc_lb_policy_round_robin_init(void);
+extern void grpc_lb_policy_round_robin_shutdown(void);
 
-extern int grpc_lb_round_robin_trace;
-
-#include "src/core/lib/client_config/lb_policy_factory.h"
-
-/** Returns a load balancing factory for the round robin policy */
-grpc_lb_policy_factory *grpc_round_robin_lb_factory_create();
-
-#endif /* GRPC_CORE_LIB_CLIENT_CONFIG_LB_POLICIES_ROUND_ROBIN_H */
+void grpc_register_built_in_plugins(void) {
+  grpc_register_plugin(grpc_lb_policy_pick_first_init,
+                       grpc_lb_policy_pick_first_shutdown);
+  grpc_register_plugin(grpc_lb_policy_round_robin_init,
+                       grpc_lb_policy_round_robin_shutdown);
+}
diff --git a/src/cpp/server/server.cc b/src/cpp/server/server.cc
index 7e5f557ffafd86ad11873e8420eaee111b285b1d..5ec05e4dccb8b0109fb496862fd6a7666774a468 100644
--- a/src/cpp/server/server.cc
+++ b/src/cpp/server/server.cc
@@ -264,6 +264,7 @@ class Server::SyncRequest GRPC_FINAL : public CompletionQueueTag {
   void* const tag_;
   bool in_flight_;
   const bool has_request_payload_;
+  uint32_t incoming_flags_;
   grpc_call* call_;
   grpc_call_details* call_details_;
   gpr_timespec deadline_;
@@ -334,7 +335,7 @@ bool Server::RegisterService(const grpc::string* host, Service* service) {
     }
     RpcServiceMethod* method = it->get();
     void* tag = grpc_server_register_method(server_, method->name(),
-                                            host ? host->c_str() : nullptr);
+                                            host ? host->c_str() : nullptr, 0);
     if (tag == nullptr) {
       gpr_log(GPR_DEBUG, "Attempt to register %s multiple times",
               method->name());
diff --git a/src/python/grpcio/grpc/_cython/imports.generated.h b/src/python/grpcio/grpc/_cython/imports.generated.h
index 4d18369e1f499fb9d7db346a106fdad112e8eacc..adcd8e954a3af5c3512e0474afaadab11444648d 100644
--- a/src/python/grpcio/grpc/_cython/imports.generated.h
+++ b/src/python/grpcio/grpc/_cython/imports.generated.h
@@ -283,7 +283,7 @@ extern grpc_call_destroy_type grpc_call_destroy_import;
 typedef grpc_call_error(*grpc_server_request_call_type)(grpc_server *server, grpc_call **call, grpc_call_details *details, grpc_metadata_array *request_metadata, grpc_completion_queue *cq_bound_to_call, grpc_completion_queue *cq_for_notification, void *tag_new);
 extern grpc_server_request_call_type grpc_server_request_call_import;
 #define grpc_server_request_call grpc_server_request_call_import
-typedef void *(*grpc_server_register_method_type)(grpc_server *server, const char *method, const char *host);
+typedef void *(*grpc_server_register_method_type)(grpc_server *server, const char *method, const char *host, uint32_t flags);
 extern grpc_server_register_method_type grpc_server_register_method_import;
 #define grpc_server_register_method grpc_server_register_method_import
 typedef grpc_call_error(*grpc_server_request_registered_call_type)(grpc_server *server, void *registered_method, grpc_call **call, gpr_timespec *deadline, grpc_metadata_array *request_metadata, grpc_byte_buffer **optional_payload, grpc_completion_queue *cq_bound_to_call, grpc_completion_queue *cq_for_notification, void *tag_new);
diff --git a/src/python/grpcio/grpc_core_dependencies.py b/src/python/grpcio/grpc_core_dependencies.py
index 3c57ad71daa6f5819aa6775b6d836c2eec57bc20..3cd8f62221fcfd1dc2d220e00b3bd084bee10a76 100644
--- a/src/python/grpcio/grpc_core_dependencies.py
+++ b/src/python/grpcio/grpc_core_dependencies.py
@@ -74,6 +74,10 @@ CORE_SOURCE_FILES = [
   'src/core/lib/support/tmpfile_posix.c',
   'src/core/lib/support/tmpfile_win32.c',
   'src/core/lib/support/wrap_memcpy.c',
+  'src/core/ext/lb_policy/grpclb/load_balancer_api.c',
+  'src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c',
+  'src/core/ext/lb_policy/pick_first/pick_first.c',
+  'src/core/ext/lb_policy/round_robin/round_robin.c',
   'src/core/ext/transport/chttp2/client/insecure/channel_create.c',
   'src/core/ext/transport/chttp2/client/secure/secure_channel_create.c',
   'src/core/ext/transport/chttp2/server/insecure/server_chttp2.c',
@@ -121,9 +125,6 @@ CORE_SOURCE_FILES = [
   'src/core/lib/client_config/connector.c',
   'src/core/lib/client_config/default_initial_connect_string.c',
   'src/core/lib/client_config/initial_connect_string.c',
-  'src/core/lib/client_config/lb_policies/load_balancer_api.c',
-  'src/core/lib/client_config/lb_policies/pick_first.c',
-  'src/core/lib/client_config/lb_policies/round_robin.c',
   'src/core/lib/client_config/lb_policy.c',
   'src/core/lib/client_config/lb_policy_factory.c',
   'src/core/lib/client_config/lb_policy_registry.c',
@@ -189,7 +190,6 @@ CORE_SOURCE_FILES = [
   'src/core/lib/json/json_reader.c',
   'src/core/lib/json/json_string.c',
   'src/core/lib/json/json_writer.c',
-  'src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c',
   'src/core/lib/security/b64.c',
   'src/core/lib/security/client_auth_filter.c',
   'src/core/lib/security/credentials.c',
@@ -235,6 +235,7 @@ CORE_SOURCE_FILES = [
   'src/core/lib/tsi/fake_transport_security.c',
   'src/core/lib/tsi/ssl_transport_security.c',
   'src/core/lib/tsi/transport_security.c',
+  'src/core/plugin_registry/grpc_plugin_registry.c',
   'third_party/nanopb/pb_common.c',
   'third_party/nanopb/pb_decode.c',
   'third_party/nanopb/pb_encode.c',
diff --git a/src/ruby/ext/grpc/rb_grpc_imports.generated.h b/src/ruby/ext/grpc/rb_grpc_imports.generated.h
index 3bf81af8fbcc0d927bc7bd7b3b13acbe290d9bf8..22ea84c75091e59827554471ae2a97ae1bf47fe3 100644
--- a/src/ruby/ext/grpc/rb_grpc_imports.generated.h
+++ b/src/ruby/ext/grpc/rb_grpc_imports.generated.h
@@ -283,7 +283,7 @@ extern grpc_call_destroy_type grpc_call_destroy_import;
 typedef grpc_call_error(*grpc_server_request_call_type)(grpc_server *server, grpc_call **call, grpc_call_details *details, grpc_metadata_array *request_metadata, grpc_completion_queue *cq_bound_to_call, grpc_completion_queue *cq_for_notification, void *tag_new);
 extern grpc_server_request_call_type grpc_server_request_call_import;
 #define grpc_server_request_call grpc_server_request_call_import
-typedef void *(*grpc_server_register_method_type)(grpc_server *server, const char *method, const char *host);
+typedef void *(*grpc_server_register_method_type)(grpc_server *server, const char *method, const char *host, uint32_t flags);
 extern grpc_server_register_method_type grpc_server_register_method_import;
 #define grpc_server_register_method grpc_server_register_method_import
 typedef grpc_call_error(*grpc_server_request_registered_call_type)(grpc_server *server, void *registered_method, grpc_call **call, gpr_timespec *deadline, grpc_metadata_array *request_metadata, grpc_byte_buffer **optional_payload, grpc_completion_queue *cq_bound_to_call, grpc_completion_queue *cq_for_notification, void *tag_new);
diff --git a/templates/src/core/plugin_registry.template b/templates/src/core/plugin_registry.template
new file mode 100644
index 0000000000000000000000000000000000000000..352682c3f0b3c5a081c2c81674dccadc48feda9d
--- /dev/null
+++ b/templates/src/core/plugin_registry.template
@@ -0,0 +1,52 @@
+%YAML 1.2
+---
+foreach: libs
+cond: selected.get('generate_plugin_registry', False)
+output_name: ${selected.name}_plugin_registry.c
+template: |
+  /*
+   *
+   * Copyright 2016, Google Inc.
+   * All rights reserved.
+   *
+   * Redistribution and use in source and binary forms, with or without
+   * modification, are permitted provided that the following conditions are
+   * met:
+   *
+   *     * Redistributions of source code must retain the above copyright
+   * notice, this list of conditions and the following disclaimer.
+   *     * Redistributions in binary form must reproduce the above
+   * copyright notice, this list of conditions and the following disclaimer
+   * in the documentation and/or other materials provided with the
+   * distribution.
+   *     * Neither the name of Google Inc. nor the names of its
+   * contributors may be used to endorse or promote products derived from
+   * this software without specific prior written permission.
+   *
+   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+   *
+   */
+
+  #include <grpc/grpc.h>
+
+  %for plugin in selected.plugins:
+  extern void ${plugin}_init(void);
+  extern void ${plugin}_shutdown(void);
+  %endfor
+
+  void grpc_register_built_in_plugins(void) {
+  %for plugin in selected.plugins:
+    grpc_register_plugin(${plugin}_init,
+                         ${plugin}_shutdown);
+  %endfor
+  }
diff --git a/test/core/bad_client/bad_client.c b/test/core/bad_client/bad_client.c
index 7fd7a00c81f81f995a96ff62904f15cf4f6d4eb4..d385cab37230bf6740e5132b7908d19bf0d39796 100644
--- a/test/core/bad_client/bad_client.c
+++ b/test/core/bad_client/bad_client.c
@@ -33,6 +33,9 @@
 
 #include "test/core/bad_client/bad_client.h"
 
+#include <grpc/support/alloc.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
 #include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/channel/channel_stack.h"
 #include "src/core/lib/channel/http_server_filter.h"
@@ -41,10 +44,6 @@
 #include "src/core/lib/surface/completion_queue.h"
 #include "src/core/lib/surface/server.h"
 
-#include <grpc/support/alloc.h>
-#include <grpc/support/sync.h>
-#include <grpc/support/thd.h>
-
 typedef struct {
   grpc_server *server;
   grpc_completion_queue *cq;
@@ -110,7 +109,7 @@ void grpc_run_bad_client_test(grpc_bad_client_server_side_validator validator,
   grpc_server_register_completion_queue(a.server, a.cq, NULL);
   a.registered_method =
       grpc_server_register_method(a.server, GRPC_BAD_CLIENT_REGISTERED_METHOD,
-                                  GRPC_BAD_CLIENT_REGISTERED_HOST);
+                                  GRPC_BAD_CLIENT_REGISTERED_HOST, 0);
   grpc_server_start(a.server);
   transport = grpc_create_chttp2_transport(&exec_ctx, NULL, sfd.server, 0);
   server_setup_transport(&a, transport);
diff --git a/test/core/client_config/lb_policies_test.c b/test/core/client_config/lb_policies_test.c
index bc7040de776114fdfbe6df64f7e35f4ebdfe514c..ac42891f946f920a580605b892a5984738d53416 100644
--- a/test/core/client_config/lb_policies_test.c
+++ b/test/core/client_config/lb_policies_test.c
@@ -43,7 +43,6 @@
 
 #include "src/core/lib/channel/channel_stack.h"
 #include "src/core/lib/channel/client_channel.h"
-#include "src/core/lib/client_config/lb_policies/round_robin.h"
 #include "src/core/lib/client_config/lb_policy_registry.h"
 #include "src/core/lib/support/string.h"
 #include "src/core/lib/surface/channel.h"
@@ -881,7 +880,7 @@ int main(int argc, char **argv) {
 
   grpc_test_init(argc, argv);
   grpc_init();
-  grpc_lb_round_robin_trace = 1;
+  grpc_tracer_set_enabled("round_robin", 1);
 
   GPR_ASSERT(grpc_lb_policy_create(&exec_ctx, "this-lb-policy-does-not-exist",
                                    NULL) == NULL);
diff --git a/test/core/end2end/end2end_nosec_tests.c b/test/core/end2end/end2end_nosec_tests.c
index b8934512c67a417e4fd52feb5414561d9b2aa095..f560900a257a642c9f3dc2680285693f8a757022 100644
--- a/test/core/end2end/end2end_nosec_tests.c
+++ b/test/core/end2end/end2end_nosec_tests.c
@@ -56,6 +56,7 @@ extern void empty_batch(grpc_end2end_test_config config);
 extern void graceful_server_shutdown(grpc_end2end_test_config config);
 extern void high_initial_seqno(grpc_end2end_test_config config);
 extern void hpack_size(grpc_end2end_test_config config);
+extern void idempotent_request(grpc_end2end_test_config config);
 extern void invoke_large_request(grpc_end2end_test_config config);
 extern void large_metadata(grpc_end2end_test_config config);
 extern void max_concurrent_streams(grpc_end2end_test_config config);
@@ -97,6 +98,7 @@ void grpc_end2end_tests(int argc, char **argv,
     graceful_server_shutdown(config);
     high_initial_seqno(config);
     hpack_size(config);
+    idempotent_request(config);
     invoke_large_request(config);
     large_metadata(config);
     max_concurrent_streams(config);
@@ -184,6 +186,10 @@ void grpc_end2end_tests(int argc, char **argv,
       hpack_size(config);
       continue;
     }
+    if (0 == strcmp("idempotent_request", argv[i])) {
+      idempotent_request(config);
+      continue;
+    }
     if (0 == strcmp("invoke_large_request", argv[i])) {
       invoke_large_request(config);
       continue;
diff --git a/test/core/end2end/end2end_tests.c b/test/core/end2end/end2end_tests.c
index f0969794c605d92e659a70cdacbb0e0ed61fcdd6..f191c3a20ddfc6c18cabe4f0f7fd01ee3f20253a 100644
--- a/test/core/end2end/end2end_tests.c
+++ b/test/core/end2end/end2end_tests.c
@@ -57,6 +57,7 @@ extern void empty_batch(grpc_end2end_test_config config);
 extern void graceful_server_shutdown(grpc_end2end_test_config config);
 extern void high_initial_seqno(grpc_end2end_test_config config);
 extern void hpack_size(grpc_end2end_test_config config);
+extern void idempotent_request(grpc_end2end_test_config config);
 extern void invoke_large_request(grpc_end2end_test_config config);
 extern void large_metadata(grpc_end2end_test_config config);
 extern void max_concurrent_streams(grpc_end2end_test_config config);
@@ -99,6 +100,7 @@ void grpc_end2end_tests(int argc, char **argv,
     graceful_server_shutdown(config);
     high_initial_seqno(config);
     hpack_size(config);
+    idempotent_request(config);
     invoke_large_request(config);
     large_metadata(config);
     max_concurrent_streams(config);
@@ -190,6 +192,10 @@ void grpc_end2end_tests(int argc, char **argv,
       hpack_size(config);
       continue;
     }
+    if (0 == strcmp("idempotent_request", argv[i])) {
+      idempotent_request(config);
+      continue;
+    }
     if (0 == strcmp("invoke_large_request", argv[i])) {
       invoke_large_request(config);
       continue;
diff --git a/test/core/end2end/fixtures/proxy.c b/test/core/end2end/fixtures/proxy.c
index 434e75dd15ed22b9c3a80708ec91746d1f022cad..1ca53cdad9cbfcdb9490d84e210bc10bba66e965 100644
--- a/test/core/end2end/fixtures/proxy.c
+++ b/test/core/end2end/fixtures/proxy.c
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -338,10 +338,10 @@ static void on_new_call(void *arg, int success) {
         proxy->new_call_details.deadline, NULL);
     gpr_ref_init(&pc->refs, 1);
 
-    op.flags = 0;
     op.reserved = NULL;
 
     op.op = GRPC_OP_RECV_INITIAL_METADATA;
+    op.flags = 0;
     op.data.recv_initial_metadata = &pc->p2s_initial_metadata;
     refpc(pc, "on_p2s_recv_initial_metadata");
     err = grpc_call_start_batch(
@@ -349,6 +349,7 @@ static void on_new_call(void *arg, int success) {
     GPR_ASSERT(err == GRPC_CALL_OK);
 
     op.op = GRPC_OP_SEND_INITIAL_METADATA;
+    op.flags = proxy->new_call_details.flags;
     op.data.send_initial_metadata.count = pc->c2p_initial_metadata.count;
     op.data.send_initial_metadata.metadata = pc->c2p_initial_metadata.metadata;
     refpc(pc, "on_p2s_sent_initial_metadata");
@@ -357,6 +358,7 @@ static void on_new_call(void *arg, int success) {
     GPR_ASSERT(err == GRPC_CALL_OK);
 
     op.op = GRPC_OP_RECV_MESSAGE;
+    op.flags = 0;
     op.data.recv_message = &pc->c2p_msg;
     refpc(pc, "on_c2p_recv_msg");
     err = grpc_call_start_batch(pc->c2p, &op, 1,
@@ -364,6 +366,7 @@ static void on_new_call(void *arg, int success) {
     GPR_ASSERT(err == GRPC_CALL_OK);
 
     op.op = GRPC_OP_RECV_MESSAGE;
+    op.flags = 0;
     op.data.recv_message = &pc->p2s_msg;
     refpc(pc, "on_p2s_recv_msg");
     err = grpc_call_start_batch(pc->p2s, &op, 1,
@@ -371,6 +374,7 @@ static void on_new_call(void *arg, int success) {
     GPR_ASSERT(err == GRPC_CALL_OK);
 
     op.op = GRPC_OP_RECV_STATUS_ON_CLIENT;
+    op.flags = 0;
     op.data.recv_status_on_client.trailing_metadata =
         &pc->p2s_trailing_metadata;
     op.data.recv_status_on_client.status = &pc->p2s_status;
@@ -383,6 +387,7 @@ static void on_new_call(void *arg, int success) {
     GPR_ASSERT(err == GRPC_CALL_OK);
 
     op.op = GRPC_OP_RECV_CLOSE_ON_SERVER;
+    op.flags = 0;
     op.data.recv_close_on_server.cancelled = &pc->c2p_server_cancelled;
     refpc(pc, "on_c2p_closed");
     err = grpc_call_start_batch(pc->c2p, &op, 1, new_closure(on_c2p_closed, pc),
diff --git a/test/core/end2end/gen_build_yaml.py b/test/core/end2end/gen_build_yaml.py
index 93b48c331c62a677ebfe36a751fa99955086fcd2..6da9028066fb0a5cd65a96d50930cb693eae93c7 100755
--- a/test/core/end2end/gen_build_yaml.py
+++ b/test/core/end2end/gen_build_yaml.py
@@ -104,6 +104,7 @@ END2END_TESTS = {
     'hpack_size': default_test_options._replace(proxyable=False,
                                                 traceable=False),
     'high_initial_seqno': default_test_options,
+    'idempotent_request': default_test_options,
     'invoke_large_request': default_test_options,
     'large_metadata': default_test_options,
     'max_concurrent_streams': default_test_options._replace(proxyable=False),
diff --git a/test/core/end2end/tests/idempotent_request.c b/test/core/end2end/tests/idempotent_request.c
new file mode 100644
index 0000000000000000000000000000000000000000..485a8544419849a86c2895a98d9f6d6401746893
--- /dev/null
+++ b/test/core/end2end/tests/idempotent_request.c
@@ -0,0 +1,248 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/core/end2end/end2end_tests.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include <grpc/byte_buffer.h>
+#include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/time.h>
+#include <grpc/support/useful.h>
+#include "src/core/lib/support/string.h"
+#include "test/core/end2end/cq_verifier.h"
+
+enum { TIMEOUT = 200000 };
+
+static void *tag(intptr_t t) { return (void *)t; }
+
+static grpc_end2end_test_fixture begin_test(grpc_end2end_test_config config,
+                                            const char *test_name,
+                                            grpc_channel_args *client_args,
+                                            grpc_channel_args *server_args) {
+  grpc_end2end_test_fixture f;
+  gpr_log(GPR_INFO, "%s/%s", test_name, config.name);
+  f = config.create_fixture(client_args, server_args);
+  config.init_server(&f, server_args);
+  config.init_client(&f, client_args);
+  return f;
+}
+
+static gpr_timespec n_seconds_time(int n) {
+  return GRPC_TIMEOUT_SECONDS_TO_DEADLINE(n);
+}
+
+static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }
+
+static void drain_cq(grpc_completion_queue *cq) {
+  grpc_event ev;
+  do {
+    ev = grpc_completion_queue_next(cq, five_seconds_time(), NULL);
+  } while (ev.type != GRPC_QUEUE_SHUTDOWN);
+}
+
+static void shutdown_server(grpc_end2end_test_fixture *f) {
+  if (!f->server) return;
+  grpc_server_shutdown_and_notify(f->server, f->cq, tag(1000));
+  GPR_ASSERT(grpc_completion_queue_pluck(
+                 f->cq, tag(1000), GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5), NULL)
+                 .type == GRPC_OP_COMPLETE);
+  grpc_server_destroy(f->server);
+  f->server = NULL;
+}
+
+static void shutdown_client(grpc_end2end_test_fixture *f) {
+  if (!f->client) return;
+  grpc_channel_destroy(f->client);
+  f->client = NULL;
+}
+
+static void end_test(grpc_end2end_test_fixture *f) {
+  shutdown_server(f);
+  shutdown_client(f);
+
+  grpc_completion_queue_shutdown(f->cq);
+  drain_cq(f->cq);
+  grpc_completion_queue_destroy(f->cq);
+}
+
+static void simple_request_body(grpc_end2end_test_fixture f) {
+  grpc_call *c;
+  grpc_call *s;
+  gpr_timespec deadline = five_seconds_time();
+  cq_verifier *cqv = cq_verifier_create(f.cq);
+  grpc_op ops[6];
+  grpc_op *op;
+  grpc_metadata_array initial_metadata_recv;
+  grpc_metadata_array trailing_metadata_recv;
+  grpc_metadata_array request_metadata_recv;
+  grpc_call_details call_details;
+  grpc_status_code status;
+  grpc_call_error error;
+  char *details = NULL;
+  size_t details_capacity = 0;
+  int was_cancelled = 2;
+  char *peer;
+
+  c = grpc_channel_create_call(f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
+                               "/foo", "foo.test.google.fr:1234", deadline,
+                               NULL);
+  GPR_ASSERT(c);
+
+  peer = grpc_call_get_peer(c);
+  GPR_ASSERT(peer != NULL);
+  gpr_log(GPR_DEBUG, "client_peer_before_call=%s", peer);
+  gpr_free(peer);
+
+  grpc_metadata_array_init(&initial_metadata_recv);
+  grpc_metadata_array_init(&trailing_metadata_recv);
+  grpc_metadata_array_init(&request_metadata_recv);
+  grpc_call_details_init(&call_details);
+
+  op = ops;
+  op->op = GRPC_OP_SEND_INITIAL_METADATA;
+  op->data.send_initial_metadata.count = 0;
+  op->flags = GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_INITIAL_METADATA;
+  op->data.recv_initial_metadata = &initial_metadata_recv;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
+  op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv;
+  op->data.recv_status_on_client.status = &status;
+  op->data.recv_status_on_client.status_details = &details;
+  op->data.recv_status_on_client.status_details_capacity = &details_capacity;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
+  GPR_ASSERT(GRPC_CALL_OK == error);
+
+  error =
+      grpc_server_request_call(f.server, &s, &call_details,
+                               &request_metadata_recv, f.cq, f.cq, tag(101));
+  GPR_ASSERT(GRPC_CALL_OK == error);
+  cq_expect_completion(cqv, tag(101), 1);
+  cq_verify(cqv);
+
+  peer = grpc_call_get_peer(s);
+  GPR_ASSERT(peer != NULL);
+  gpr_log(GPR_DEBUG, "server_peer=%s", peer);
+  gpr_free(peer);
+  peer = grpc_call_get_peer(c);
+  GPR_ASSERT(peer != NULL);
+  gpr_log(GPR_DEBUG, "client_peer=%s", peer);
+  gpr_free(peer);
+
+  op = ops;
+  op->op = GRPC_OP_SEND_INITIAL_METADATA;
+  op->data.send_initial_metadata.count = 0;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_SEND_STATUS_FROM_SERVER;
+  op->data.send_status_from_server.trailing_metadata_count = 0;
+  op->data.send_status_from_server.status = GRPC_STATUS_UNIMPLEMENTED;
+  op->data.send_status_from_server.status_details = "xyz";
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
+  op->data.recv_close_on_server.cancelled = &was_cancelled;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
+  GPR_ASSERT(GRPC_CALL_OK == error);
+
+  cq_expect_completion(cqv, tag(102), 1);
+  cq_expect_completion(cqv, tag(1), 1);
+  cq_verify(cqv);
+
+  GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
+  GPR_ASSERT(0 == strcmp(details, "xyz"));
+  GPR_ASSERT(0 == strcmp(call_details.method, "/foo"));
+  GPR_ASSERT(0 == strcmp(call_details.host, "foo.test.google.fr:1234"));
+  GPR_ASSERT(GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST == call_details.flags);
+  GPR_ASSERT(was_cancelled == 1);
+
+  gpr_free(details);
+  grpc_metadata_array_destroy(&initial_metadata_recv);
+  grpc_metadata_array_destroy(&trailing_metadata_recv);
+  grpc_metadata_array_destroy(&request_metadata_recv);
+  grpc_call_details_destroy(&call_details);
+
+  grpc_call_destroy(c);
+  grpc_call_destroy(s);
+
+  cq_verifier_destroy(cqv);
+}
+
+static void test_invoke_simple_request(grpc_end2end_test_config config) {
+  grpc_end2end_test_fixture f;
+
+  f = begin_test(config, "test_invoke_simple_request", NULL, NULL);
+  simple_request_body(f);
+  end_test(&f);
+  config.tear_down_data(&f);
+}
+
+static void test_invoke_10_simple_requests(grpc_end2end_test_config config) {
+  int i;
+  grpc_end2end_test_fixture f =
+      begin_test(config, "test_invoke_10_simple_requests", NULL, NULL);
+  for (i = 0; i < 10; i++) {
+    simple_request_body(f);
+    gpr_log(GPR_INFO, "Passed simple request %d", i);
+  }
+  end_test(&f);
+  config.tear_down_data(&f);
+}
+
+void idempotent_request(grpc_end2end_test_config config) {
+  int i;
+  for (i = 0; i < 10; i++) {
+    test_invoke_simple_request(config);
+  }
+  test_invoke_10_simple_requests(config);
+}
diff --git a/test/core/end2end/tests/simple_request.c b/test/core/end2end/tests/simple_request.c
index bc634ef83a22a267eddd21bf471b1c56c948d2e3..d75c5594a90473c4b9d679c4ea985da96b5d7877 100644
--- a/test/core/end2end/tests/simple_request.c
+++ b/test/core/end2end/tests/simple_request.c
@@ -203,6 +203,7 @@ static void simple_request_body(grpc_end2end_test_fixture f) {
   GPR_ASSERT(0 == strcmp(details, "xyz"));
   GPR_ASSERT(0 == strcmp(call_details.method, "/foo"));
   GPR_ASSERT(0 == strcmp(call_details.host, "foo.test.google.fr:1234"));
+  GPR_ASSERT(0 == call_details.flags);
   GPR_ASSERT(was_cancelled == 1);
 
   gpr_free(details);
diff --git a/test/core/internal_api_canaries/iomgr.c b/test/core/internal_api_canaries/iomgr.c
new file mode 100644
index 0000000000000000000000000000000000000000..04d66994cd23bc6b8ee7b1da5640a38a2eafac22
--- /dev/null
+++ b/test/core/internal_api_canaries/iomgr.c
@@ -0,0 +1,115 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/lib/iomgr/iomgr.h"
+#include "src/core/lib/iomgr/closure.h"
+#include "src/core/lib/iomgr/endpoint.h"
+#include "src/core/lib/iomgr/exec_ctx.h"
+#include "src/core/lib/iomgr/executor.h"
+
+/*******************************************************************************
+ * NOTE: If this test fails to compile, then the api changes are likely to cause
+ *       merge failures downstream. Please pay special attention to reviewing
+ *       these changes, and solicit help as appropriate when merging downstream.
+ *
+ * This test is NOT expected to be run directly.
+ ******************************************************************************/
+
+static void test_code(void) {
+  /* iomgr.h */
+  grpc_iomgr_init();
+  grpc_iomgr_shutdown();
+
+  /* closure.h */
+  grpc_closure closure;
+  closure.cb = NULL;
+  closure.cb_arg = NULL;
+  closure.final_data = 0;
+
+  grpc_closure_list closure_list = GRPC_CLOSURE_LIST_INIT;
+  closure_list.head = NULL;
+  closure_list.tail = NULL;
+
+  grpc_closure_init(&closure, NULL, NULL);
+
+  grpc_closure_create(NULL, NULL);
+
+  grpc_closure_list_move(NULL, NULL);
+  grpc_closure_list_add(NULL, NULL, true);
+  bool x = grpc_closure_list_empty(closure_list);
+  grpc_closure_next(&closure);
+
+  /* exec_ctx.h */
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_exec_ctx_flush(&exec_ctx);
+  grpc_exec_ctx_finish(&exec_ctx);
+  grpc_exec_ctx_enqueue(&exec_ctx, &closure, x, NULL);
+  grpc_exec_ctx_enqueue_list(&exec_ctx, &closure_list, NULL);
+
+  /* endpoint.h */
+  grpc_endpoint endpoint;
+  grpc_endpoint_vtable vtable = {
+      grpc_endpoint_read,           grpc_endpoint_write,
+      grpc_endpoint_add_to_pollset, grpc_endpoint_add_to_pollset_set,
+      grpc_endpoint_shutdown,       grpc_endpoint_destroy,
+      grpc_endpoint_get_peer};
+  endpoint.vtable = &vtable;
+
+  grpc_endpoint_read(&exec_ctx, &endpoint, NULL, NULL);
+  grpc_endpoint_get_peer(&endpoint);
+  grpc_endpoint_write(&exec_ctx, &endpoint, NULL, NULL);
+  grpc_endpoint_shutdown(&exec_ctx, &endpoint);
+  grpc_endpoint_destroy(&exec_ctx, &endpoint);
+  grpc_endpoint_add_to_pollset(&exec_ctx, &endpoint, NULL);
+  grpc_endpoint_add_to_pollset_set(&exec_ctx, &endpoint, NULL);
+
+  /* executor.h */
+  grpc_executor_init();
+  grpc_executor_enqueue(&closure, x);
+  grpc_executor_shutdown();
+
+  /* pollset.h */
+  grpc_pollset_size();
+  grpc_pollset_init(NULL, NULL);
+  grpc_pollset_shutdown(NULL, NULL, NULL);
+  grpc_pollset_reset(NULL);
+  grpc_pollset_destroy(NULL);
+  grpc_pollset_work(NULL, NULL, NULL, gpr_now(GPR_CLOCK_REALTIME),
+                    gpr_now(GPR_CLOCK_MONOTONIC));
+  grpc_pollset_kick(NULL, NULL);
+}
+
+int main(void) {
+  if (false) test_code();
+  return 0;
+}
diff --git a/test/core/internal_api_canaries/support.c b/test/core/internal_api_canaries/support.c
new file mode 100644
index 0000000000000000000000000000000000000000..7e00e0d2ff74da5642ad993e050372170be56e4a
--- /dev/null
+++ b/test/core/internal_api_canaries/support.c
@@ -0,0 +1,58 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*******************************************************************************
+ * NOTE: If this test fails to compile, then the api changes are likely to cause
+ *       merge failures downstream. Please pay special attention to reviewing
+ *       these changes, and solicit help as appropriate when merging downstream.
+ *
+ * This test is NOT expected to be run directly.
+ ******************************************************************************/
+
+#include "src/core/lib/support/env.h"
+#include "src/core/lib/support/load_file.h"
+#include "src/core/lib/support/tmpfile.h"
+
+static void test_code(void) {
+  /* env.h */
+  gpr_set_env("abc", gpr_getenv("xyz"));
+  /* load_file.h */
+  gpr_load_file("abc", 1, NULL);
+  /* tmpfile.h */
+  fclose(gpr_tmpfile("foo", NULL));
+}
+
+int main(void) {
+  if (false) test_code();
+  return 0;
+}
diff --git a/test/core/internal_api_canaries/transport.c b/test/core/internal_api_canaries/transport.c
new file mode 100644
index 0000000000000000000000000000000000000000..01daabaa56617a1ec92e0972e12ca488d0cbfe76
--- /dev/null
+++ b/test/core/internal_api_canaries/transport.c
@@ -0,0 +1,81 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*******************************************************************************
+ * NOTE: If this test fails to compile, then the api changes are likely to cause
+ *       merge failures downstream. Please pay special attention to reviewing
+ *       these changes, and solicit help as appropriate when merging downstream.
+ *
+ * This test is NOT expected to be run directly.
+ ******************************************************************************/
+
+#include "src/core/lib/transport/transport.h"
+#include "src/core/lib/transport/transport_impl.h"
+
+static void test_code(void) {
+  /* transport_impl.h */
+  grpc_transport transport;
+  grpc_transport_vtable vtable = {12345,
+                                  grpc_transport_init_stream,
+                                  grpc_transport_set_pollset,
+                                  grpc_transport_perform_stream_op,
+                                  grpc_transport_perform_op,
+                                  grpc_transport_destroy_stream,
+                                  grpc_transport_destroy,
+                                  grpc_transport_get_peer};
+  transport.vtable = &vtable;
+
+  /* transport.h */
+  GRPC_STREAM_REF_INIT(NULL, 0, NULL, NULL, "xyz");
+  GPR_ASSERT(0 == grpc_transport_stream_size(NULL));
+  GPR_ASSERT(grpc_transport_init_stream(&transport, NULL, NULL, NULL, NULL));
+  grpc_transport_set_pollset(&transport, NULL, NULL, NULL);
+  grpc_transport_destroy_stream(&transport, NULL, NULL);
+  grpc_transport_stream_op_finish_with_failure(NULL, NULL);
+  grpc_transport_stream_op_add_cancellation(NULL, GRPC_STATUS_UNAVAILABLE);
+  grpc_transport_stream_op_add_close(NULL, GRPC_STATUS_UNAVAILABLE,
+                                     grpc_transport_op_string(NULL));
+  grpc_transport_perform_stream_op(&transport, NULL, NULL, NULL);
+  grpc_transport_perform_op(&transport, NULL, NULL);
+  grpc_transport_ping(&transport, NULL);
+  grpc_transport_goaway(&transport, GRPC_STATUS_UNAVAILABLE,
+                        gpr_slice_malloc(0));
+  grpc_transport_close(&transport);
+  grpc_transport_destroy(&transport, NULL);
+  GPR_ASSERT("xyz" == grpc_transport_get_peer(&transport, NULL));
+}
+
+int main(void) {
+  if (false) test_code();
+  return 0;
+}
diff --git a/test/core/surface/server_test.c b/test/core/surface/server_test.c
index 1d5211d2259eff26a72fc21f221223cb37abaef0..4c62d8caadbe7b59aee1b3f174ffb2c926b6993e 100644
--- a/test/core/surface/server_test.c
+++ b/test/core/surface/server_test.c
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -42,11 +42,19 @@ void test_register_method_fail(void) {
   grpc_server *server = grpc_server_create(NULL, NULL);
   void *method;
   void *method_old;
-  method = grpc_server_register_method(server, NULL, NULL);
+  method = grpc_server_register_method(server, NULL, NULL, 0);
   GPR_ASSERT(method == NULL);
-  method_old = grpc_server_register_method(server, "m", "h");
+  method_old = grpc_server_register_method(server, "m", "h", 0);
   GPR_ASSERT(method_old != NULL);
-  method = grpc_server_register_method(server, "m", "h");
+  method = grpc_server_register_method(server, "m", "h", 0);
+  GPR_ASSERT(method == NULL);
+  method_old = grpc_server_register_method(
+      server, "m2", "h2", GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST);
+  GPR_ASSERT(method_old != NULL);
+  method = grpc_server_register_method(server, "m2", "h2", 0);
+  GPR_ASSERT(method == NULL);
+  method = grpc_server_register_method(
+      server, "m2", "h2", GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST);
   GPR_ASSERT(method == NULL);
   grpc_server_destroy(server);
 }
diff --git a/test/core/transport/chttp2/hpack_encoder_test.c b/test/core/transport/chttp2/hpack_encoder_test.c
index 818ce09a7c29b0ce897ef8f82e70886e0a8bc251..464f0d93b0665c4d51a3bfff9a3fc8ff0ebe3825 100644
--- a/test/core/transport/chttp2/hpack_encoder_test.c
+++ b/test/core/transport/chttp2/hpack_encoder_test.c
@@ -34,10 +34,12 @@
 #include "src/core/ext/transport/chttp2/transport/hpack_encoder.h"
 
 #include <stdio.h>
+#include <string.h>
 
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
+
 #include "src/core/ext/transport/chttp2/transport/hpack_parser.h"
 #include "src/core/lib/support/string.h"
 #include "src/core/lib/transport/metadata.h"
@@ -93,7 +95,10 @@ static void verify(size_t window_available, int eof, size_t expect_window_used,
 
   gpr_slice_buffer_init(&output);
 
-  grpc_chttp2_encode_header(&g_compressor, 0xdeadbeef, &b, eof, &output);
+  grpc_transport_one_way_stats stats;
+  memset(&stats, 0, sizeof(stats));
+  grpc_chttp2_encode_header(&g_compressor, 0xdeadbeef, &b, eof, &stats,
+                            &output);
   merged = grpc_slice_merge(output.slices, output.count);
   gpr_slice_buffer_destroy(&output);
   grpc_metadata_batch_destroy(&b);
diff --git a/test/cpp/grpclb/grpclb_api_test.cc b/test/cpp/grpclb/grpclb_api_test.cc
index bc8219c1c7ac871939be466bb3f86ae48aa0e624..92f93c869c72c3f41a565a01367dc3101efe2054 100644
--- a/test/cpp/grpclb/grpclb_api_test.cc
+++ b/test/cpp/grpclb/grpclb_api_test.cc
@@ -34,7 +34,7 @@
 #include <gtest/gtest.h>
 #include <string>
 
-#include "src/core/lib/client_config/lb_policies/load_balancer_api.h"
+#include "src/core/ext/lb_policy/grpclb/load_balancer_api.h"
 #include "src/proto/grpc/lb/v0/load_balancer.pb.h"  // C++ version
 
 namespace grpc {
diff --git a/tools/buildgen/plugins/expand_filegroups.py b/tools/buildgen/plugins/expand_filegroups.py
index c40143ef9581ee65b0f42ce274fdd439c7655fae..0294a43271ab16473304172c334058accabe4839 100755
--- a/tools/buildgen/plugins/expand_filegroups.py
+++ b/tools/buildgen/plugins/expand_filegroups.py
@@ -75,11 +75,20 @@ def mako_plugin(dictionary):
       todo.append(cur)
     else:
       skips = 0
+      assert 'plugins' not in cur
+      plugins = []
       for uses in cur.get('uses', []):
+        for plugin in filegroups[uses]['plugins']:
+          if plugin not in plugins:
+            plugins.append(plugin)
         for lst in FILEGROUP_LISTS:
           vals = cur.get(lst, [])
           vals.extend(filegroups[uses].get(lst, []))
           cur[lst] = vals
+      cur_plugin_name = cur.get('plugin')
+      if cur_plugin_name:
+        plugins.append(cur_plugin_name)
+      cur['plugins'] = plugins
       filegroups[cur['name']] = cur
 
   # the above expansion can introduce duplicate filenames: contract them here
@@ -88,13 +97,20 @@ def mako_plugin(dictionary):
       fg[lst] = sorted(list(set(fg.get(lst, []))))
 
   for lib in libs:
+    assert 'plugins' not in lib
+    plugins = []
     for fg_name in lib.get('filegroups', []):
       fg = filegroups[fg_name]
-
+      for plugin in fg['plugins']:
+        if plugin not in plugins:
+          plugins.append(plugin)
       for lst in FILEGROUP_LISTS:
         vals = lib.get(lst, [])
         vals.extend(fg.get(lst, []))
         lib[lst] = vals
-
+      lib['plugins'] = plugins
+    if lib.get('generate_plugin_registry', False):
+      lib['src'].append('src/core/plugin_registry/%s_plugin_registry.c' %
+                        lib['name'])
     for lst in FILEGROUP_LISTS:
       lib[lst] = sorted(list(set(lib.get(lst, []))))
diff --git a/tools/codegen/core/gen_load_balancing_proto.sh b/tools/codegen/core/gen_load_balancing_proto.sh
index 6a5363eeb32d20542e6c33374005e189d06a8de5..339da0a7339546694c07eaa18ba52239cab80d8e 100755
--- a/tools/codegen/core/gen_load_balancing_proto.sh
+++ b/tools/codegen/core/gen_load_balancing_proto.sh
@@ -82,7 +82,7 @@ fi
 
 readonly GRPC_ROOT=$PWD
 
-OUTPUT_DIR="$GRPC_ROOT/src/core/lib/proto/grpc/lb/v0"
+OUTPUT_DIR="$GRPC_ROOT/src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0"
 if [ $# -eq 2 ]; then
   mkdir -p "$2"
   if [ $? != 0 ]; then
@@ -122,7 +122,7 @@ protoc \
 "$(basename $1)"
 
 readonly PROTO_BASENAME=$(basename $1 .proto)
-sed -i "s:$PROTO_BASENAME.pb.h:src/core/lib/proto/grpc/lb/v0/$PROTO_BASENAME.pb.h:g" \
+sed -i "s:$PROTO_BASENAME.pb.h:src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/$PROTO_BASENAME.pb.h:g" \
     "$OUTPUT_DIR/$PROTO_BASENAME.pb.c"
 
 # prepend copyright
diff --git a/tools/codegen/core/gen_static_metadata.py b/tools/codegen/core/gen_static_metadata.py
index 70d41414f45ba351aa4f93256a3b5b00fd141b48..a6336a3d55cb49d02dd8177d23d502ed005a0fd4 100755
--- a/tools/codegen/core/gen_static_metadata.py
+++ b/tools/codegen/core/gen_static_metadata.py
@@ -69,6 +69,7 @@ CONFIG = [
     (':scheme', 'grpc'),
     (':authority', ''),
     (':method', 'GET'),
+    (':method', 'PUT'),
     (':path', '/'),
     (':path', '/index.html'),
     (':status', '204'),
@@ -232,20 +233,20 @@ with open(sys.argv[0]) as my_source:
     if line[0] != '#':
       break
     copyright.append(line)
-  put_banner([H,C], [line[1:].strip() for line in copyright])
+  put_banner([H,C], [line[2:].rstrip() for line in copyright])
 
 put_banner([H,C],
 """WARNING: Auto-generated code.
 
-To make changes to this file, change tools/codegen/core/gen_static_metadata.py,
-and then re-run it.
+To make changes to this file, change
+tools/codegen/core/gen_static_metadata.py, and then re-run it.
 
-See metadata.h for an explanation of the interface here, and metadata.c for an
-explanation of what's going on.
+See metadata.h for an explanation of the interface here, and metadata.c for
+an explanation of what's going on.
 """.splitlines())
 
-print >>H, '#ifndef GRPC_INTERNAL_CORE_TRANSPORT_STATIC_METADATA_H'
-print >>H, '#define GRPC_INTERNAL_CORE_TRANSPORT_STATIC_METADATA_H'
+print >>H, '#ifndef GRPC_CORE_LIB_TRANSPORT_STATIC_METADATA_H'
+print >>H, '#define GRPC_CORE_LIB_TRANSPORT_STATIC_METADATA_H'
 print >>H
 print >>H, '#include "src/core/lib/transport/metadata.h"'
 print >>H
@@ -264,13 +265,13 @@ print >>C
 
 print >>H, '#define GRPC_STATIC_MDELEM_COUNT %d' % len(all_elems)
 print >>H, 'extern grpc_mdelem grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT];'
-print >>H, 'extern gpr_uintptr grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];'
+print >>H, 'extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];'
 for i, elem in enumerate(all_elems):
   print >>H, '/* "%s": "%s" */' % elem
   print >>H, '#define %s (&grpc_static_mdelem_table[%d])' % (mangle(elem).upper(), i)
 print >>H
 print >>C, 'grpc_mdelem grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT];'
-print >>C, 'gpr_uintptr grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT] = {'
+print >>C, 'uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT] = {'
 print >>C, '  %s' % ','.join('%d' % static_userdata.get(elem, 0) for elem in all_elems)
 print >>C, '};'
 print >>C
@@ -285,8 +286,8 @@ def md_idx(m):
     if m == m2:
       return i
 
-print >>H, 'extern const gpr_uint8 grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT*2];'
-print >>C, 'const gpr_uint8 grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT*2] = {'
+print >>H, 'extern const uint8_t grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT*2];'
+print >>C, 'const uint8_t grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT*2] = {'
 print >>C, ','.join('%d' % str_idx(x) for x in itertools.chain.from_iterable([a,b] for a, b in all_elems))
 print >>C, '};'
 print >>C
@@ -297,15 +298,15 @@ print >>C, '%s' % ',\n'.join('  "%s"' % s for s in all_strs)
 print >>C, '};'
 print >>C
 
-print >>H, 'extern const gpr_uint8 grpc_static_accept_encoding_metadata[%d];' % (1 << len(COMPRESSION_ALGORITHMS))
-print >>C, 'const gpr_uint8 grpc_static_accept_encoding_metadata[%d] = {' % (1 << len(COMPRESSION_ALGORITHMS))
+print >>H, 'extern const uint8_t grpc_static_accept_encoding_metadata[%d];' % (1 << len(COMPRESSION_ALGORITHMS))
+print >>C, 'const uint8_t grpc_static_accept_encoding_metadata[%d] = {' % (1 << len(COMPRESSION_ALGORITHMS))
 print >>C, '0,%s' % ','.join('%d' % md_idx(elem) for elem in compression_elems)
 print >>C, '};'
 print >>C
 
 print >>H, '#define GRPC_MDELEM_ACCEPT_ENCODING_FOR_ALGORITHMS(algs) (&grpc_static_mdelem_table[grpc_static_accept_encoding_metadata[(algs)]])'
 
-print >>H, '#endif /* GRPC_INTERNAL_CORE_TRANSPORT_STATIC_METADATA_H */'
+print >>H, '#endif /* GRPC_CORE_LIB_TRANSPORT_STATIC_METADATA_H */'
 
 H.close()
 C.close()
diff --git a/tools/distrib/check_include_guards.py b/tools/distrib/check_include_guards.py
index 463e3168858a893c9018f4dbd8f229c48aa61ca3..6406fe6ae700ecf89bcfadc134b00873a23f4650 100755
--- a/tools/distrib/check_include_guards.py
+++ b/tools/distrib/check_include_guards.py
@@ -167,7 +167,7 @@ argp.add_argument('--precommit',
 args = argp.parse_args()
 
 KNOWN_BAD = set([
-    'src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h',
+    'src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h',
 ])
 
 
diff --git a/tools/distrib/check_nanopb_output.sh b/tools/distrib/check_nanopb_output.sh
index e0a60946a99786caf04952e0a4d880b31580cc80..4032ae1d9db15bb2e5718c0005fc2fe9c0e7c0cb 100755
--- a/tools/distrib/check_nanopb_output.sh
+++ b/tools/distrib/check_nanopb_output.sh
@@ -60,7 +60,7 @@ PATH="$PROTOC_PATH:$PATH" ./tools/codegen/core/gen_load_balancing_proto.sh \
   $NANOPB_TMP_OUTPUT
 
 # compare outputs to checked compiled code
-if ! diff -r $NANOPB_TMP_OUTPUT src/core/lib/proto/grpc/lb/v0; then
-  echo "Outputs differ: $NANOPB_TMP_OUTPUT vs src/core/lib/proto/grpc/lb/v0"
+if ! diff -r $NANOPB_TMP_OUTPUT src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0; then
+  echo "Outputs differ: $NANOPB_TMP_OUTPUT vs src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0"
   exit 2
 fi
diff --git a/tools/doxygen/Doxyfile.core.internal b/tools/doxygen/Doxyfile.core.internal
index bb7177f52f2bb17685a6358dd8671102dbf90c47..b94447c55507793f648470b52338816941560edf 100644
--- a/tools/doxygen/Doxyfile.core.internal
+++ b/tools/doxygen/Doxyfile.core.internal
@@ -773,6 +773,8 @@ include/grpc/impl/codegen/grpc_types.h \
 include/grpc/impl/codegen/propagation_bits.h \
 include/grpc/impl/codegen/status.h \
 include/grpc/status.h \
+src/core/ext/lb_policy/grpclb/load_balancer_api.h \
+src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h \
 src/core/ext/transport/chttp2/transport/alpn.h \
 src/core/ext/transport/chttp2/transport/bin_encoder.h \
 src/core/ext/transport/chttp2/transport/chttp2_transport.h \
@@ -812,9 +814,6 @@ src/core/lib/channel/subchannel_call_holder.h \
 src/core/lib/client_config/client_config.h \
 src/core/lib/client_config/connector.h \
 src/core/lib/client_config/initial_connect_string.h \
-src/core/lib/client_config/lb_policies/load_balancer_api.h \
-src/core/lib/client_config/lb_policies/pick_first.h \
-src/core/lib/client_config/lb_policies/round_robin.h \
 src/core/lib/client_config/lb_policy.h \
 src/core/lib/client_config/lb_policy_factory.h \
 src/core/lib/client_config/lb_policy_registry.h \
@@ -874,7 +873,6 @@ src/core/lib/json/json.h \
 src/core/lib/json/json_common.h \
 src/core/lib/json/json_reader.h \
 src/core/lib/json/json_writer.h \
-src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h \
 src/core/lib/security/auth_filters.h \
 src/core/lib/security/b64.h \
 src/core/lib/security/credentials.h \
@@ -914,6 +912,10 @@ third_party/nanopb/pb.h \
 third_party/nanopb/pb_common.h \
 third_party/nanopb/pb_decode.h \
 third_party/nanopb/pb_encode.h \
+src/core/ext/lb_policy/grpclb/load_balancer_api.c \
+src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c \
+src/core/ext/lb_policy/pick_first/pick_first.c \
+src/core/ext/lb_policy/round_robin/round_robin.c \
 src/core/ext/transport/chttp2/client/insecure/channel_create.c \
 src/core/ext/transport/chttp2/client/secure/secure_channel_create.c \
 src/core/ext/transport/chttp2/server/insecure/server_chttp2.c \
@@ -961,9 +963,6 @@ src/core/lib/client_config/client_config.c \
 src/core/lib/client_config/connector.c \
 src/core/lib/client_config/default_initial_connect_string.c \
 src/core/lib/client_config/initial_connect_string.c \
-src/core/lib/client_config/lb_policies/load_balancer_api.c \
-src/core/lib/client_config/lb_policies/pick_first.c \
-src/core/lib/client_config/lb_policies/round_robin.c \
 src/core/lib/client_config/lb_policy.c \
 src/core/lib/client_config/lb_policy_factory.c \
 src/core/lib/client_config/lb_policy_registry.c \
@@ -1029,7 +1028,6 @@ src/core/lib/json/json.c \
 src/core/lib/json/json_reader.c \
 src/core/lib/json/json_string.c \
 src/core/lib/json/json_writer.c \
-src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c \
 src/core/lib/security/b64.c \
 src/core/lib/security/client_auth_filter.c \
 src/core/lib/security/credentials.c \
@@ -1075,6 +1073,7 @@ src/core/lib/transport/transport_op_string.c \
 src/core/lib/tsi/fake_transport_security.c \
 src/core/lib/tsi/ssl_transport_security.c \
 src/core/lib/tsi/transport_security.c \
+src/core/plugin_registry/grpc_plugin_registry.c \
 third_party/nanopb/pb_common.c \
 third_party/nanopb/pb_decode.c \
 third_party/nanopb/pb_encode.c \
diff --git a/tools/run_tests/jobset.py b/tools/run_tests/jobset.py
index a3b246dc084b295d17742d1e2b81d6caa4070a46..d1cfc5952f1bdf2e7ec997483c92764e090d447b 100755
--- a/tools/run_tests/jobset.py
+++ b/tools/run_tests/jobset.py
@@ -151,7 +151,8 @@ class JobSpec(object):
 
   def __init__(self, cmdline, shortname=None, environ=None, hash_targets=None,
                cwd=None, shell=False, timeout_seconds=5*60, flake_retries=0,
-               timeout_retries=0, kill_handler=None, cpu_cost=1.0):
+               timeout_retries=0, kill_handler=None, cpu_cost=1.0,
+               verbose_success=False):
     """
     Arguments:
       cmdline: a list of arguments to pass as the command line
@@ -176,6 +177,7 @@ class JobSpec(object):
     self.timeout_retries = timeout_retries
     self.kill_handler = kill_handler
     self.cpu_cost = cpu_cost
+    self.verbose_success = verbose_success
 
   def identity(self):
     return '%r %r %r' % (self.cmdline, self.environ, self.hash_targets)
@@ -287,7 +289,8 @@ class Job(object):
             cores = (user + sys) / real
             measurement = '; cpu_cost=%.01f; estimated=%.01f' % (cores, self._spec.cpu_cost)
         message('PASSED', '%s [time=%.1fsec; retries=%d:%d%s]' % (
-                    self._spec.shortname, elapsed, self._retries, self._timeout_retries, measurement),
+            self._spec.shortname, elapsed, self._retries, self._timeout_retries, measurement),
+            stdout() if self._spec.verbose_success else None,
             do_newline=self._newline_on_success or self._travis)
         self.result.state = 'PASSED'
         if self._bin_hash:
diff --git a/tools/run_tests/performance/build_performance.sh b/tools/run_tests/performance/build_performance.sh
new file mode 100755
index 0000000000000000000000000000000000000000..00cc41ec73fe1f8a240029f33faec4d19a49f8b7
--- /dev/null
+++ b/tools/run_tests/performance/build_performance.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -ex
+
+cd $(dirname $0)/../../..
+
+#TODO(jtattermusch): add support for more languages
+
+CONFIG=${CONFIG:-opt}
+
+# build C++ qps worker & driver
+make CONFIG=${CONFIG} qps_worker qps_driver -j8
diff --git a/tools/run_tests/performance/remote_host_build.sh b/tools/run_tests/performance/remote_host_build.sh
new file mode 100755
index 0000000000000000000000000000000000000000..f23ea921ce38d98591f9b24e77d92b7027371bb2
--- /dev/null
+++ b/tools/run_tests/performance/remote_host_build.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -ex
+
+cd $(dirname $0)/../../..
+
+# execute the build script remotely
+ssh "${USER_AT_HOST}" "CONFIG=${CONFIG} ~/performance_workspace/grpc/tools/run_tests/performance/build_performance.sh"
diff --git a/tools/run_tests/performance/remote_host_prepare.sh b/tools/run_tests/performance/remote_host_prepare.sh
new file mode 100755
index 0000000000000000000000000000000000000000..bad2424a6b1508e88585543a00b44104faca0f42
--- /dev/null
+++ b/tools/run_tests/performance/remote_host_prepare.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -ex
+
+cd $(dirname $0)/../../..
+
+# cleanup after previous builds
+ssh "${USER_AT_HOST}" "rm -rf ~/performance_workspace && mkdir -p ~/performance_workspace"
+
+# TODO(jtattermusch): To be sure there are not running processes that would
+# mess with the results, be rough and reboot the slave here
+# and wait for it to come back online.
+
+# push the current sources to the slave and unpack it.
+scp ../grpc.tar "${USER_AT_HOST}:~/performance_workspace"
+ssh "${USER_AT_HOST}" "tar -xf ~/performance_workspace/grpc.tar -C ~/performance_workspace"
\ No newline at end of file
diff --git a/tools/run_tests/run_performance_tests.py b/tools/run_tests/run_performance_tests.py
new file mode 100755
index 0000000000000000000000000000000000000000..77c0addb42efe55ed471003f84c168e0399aaee8
--- /dev/null
+++ b/tools/run_tests/run_performance_tests.py
@@ -0,0 +1,353 @@
+#!/usr/bin/env python2.7
+# Copyright 2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Run performance tests locally or remotely."""
+
+import argparse
+import jobset
+import multiprocessing
+import os
+import subprocess
+import sys
+import tempfile
+import time
+import uuid
+
+
+_ROOT = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), '../..'))
+os.chdir(_ROOT)
+
+
+_REMOTE_HOST_USERNAME = 'jenkins'
+
+
+class CXXLanguage:
+
+  def __init__(self):
+    self.safename = 'cxx'
+
+  def scenarios(self):
+    # TODO(jtattermusch): add more scenarios
+    return {
+            # Scenario 1: generic async streaming ping-pong (contentionless latency)
+            'cpp_async_generic_streaming_ping_pong': [
+                '--rpc_type=STREAMING',
+                '--client_type=ASYNC_CLIENT',
+                '--server_type=ASYNC_GENERIC_SERVER',
+                '--outstanding_rpcs_per_channel=1',
+                '--client_channels=1',
+                '--bbuf_req_size=0',
+                '--bbuf_resp_size=0',
+                '--async_client_threads=1',
+                '--async_server_threads=1',
+                '--secure_test=true',
+                '--num_servers=1',
+                '--num_clients=1',
+                '--server_core_limit=0',
+                '--client_core_limit=0'],
+            # Scenario 5: Sync unary ping-pong with protobufs
+            'cpp_sync_unary_ping_pong_protobuf': [
+                '--rpc_type=UNARY',
+                '--client_type=SYNC_CLIENT',
+                '--server_type=SYNC_SERVER',
+                '--outstanding_rpcs_per_channel=1',
+                '--client_channels=1',
+                '--simple_req_size=0',
+                '--simple_resp_size=0',
+                '--secure_test=true',
+                '--num_servers=1',
+                '--num_clients=1',
+                '--server_core_limit=0',
+                '--client_core_limit=0']}
+
+  def __str__(self):
+    return 'c++'
+
+
+class CSharpLanguage:
+
+  def __init__(self):
+    self.safename = str(self)
+
+  def __str__(self):
+    return 'csharp'
+
+
+class NodeLanguage:
+
+  def __init__(self):
+    pass
+    self.safename = str(self)
+
+  def __str__(self):
+    return 'node'
+
+
+_LANGUAGES = {
+    'c++' : CXXLanguage(),
+    'csharp' : CSharpLanguage(),
+    'node' : NodeLanguage(),
+}
+
+
+class QpsWorkerJob:
+  """Encapsulates a qps worker server job."""
+
+  def __init__(self, spec, host_and_port):
+    self._spec = spec
+    self.host_and_port = host_and_port
+    self._job = jobset.Job(spec, bin_hash=None, newline_on_success=True, travis=True, add_env={})
+
+  def is_running(self):
+    """Polls a job and returns True if given job is still running."""
+    return self._job.state(jobset.NoCache()) == jobset._RUNNING
+
+  def kill(self):
+    return self._job.kill()
+
+
+def create_qpsworker_job(language, port=10000, remote_host=None):
+  # TODO: support more languages
+  cmd = 'bins/opt/qps_worker --driver_port=%s' % port
+  if remote_host:
+    user_at_host = '%s@%s' % (_REMOTE_HOST_USERNAME, remote_host)
+    cmd = 'ssh %s "cd ~/performance_workspace/grpc/ && %s"' % (user_at_host, cmd)
+    host_and_port='%s:%s' % (remote_host, port)
+  else:
+    host_and_port='localhost:%s' % port
+
+  jobspec = jobset.JobSpec(
+      cmdline=[cmd],
+      shortname='qps_worker',
+      timeout_seconds=15*60,
+      shell=True)
+  return QpsWorkerJob(jobspec, host_and_port)
+
+
+def create_scenario_jobspec(scenario_name, driver_args, workers, remote_host=None):
+  """Runs one scenario using QPS driver."""
+  # setting QPS_WORKERS env variable here makes sure it works with SSH too.
+  cmd = 'QPS_WORKERS="%s" bins/opt/qps_driver ' % ','.join(workers)
+  cmd += ' '.join(driver_args)
+  if remote_host:
+    user_at_host = '%s@%s' % (_REMOTE_HOST_USERNAME, remote_host)
+    cmd = 'ssh %s "cd ~/performance_workspace/grpc/ && %s"' % (user_at_host, cmd)
+
+  return jobset.JobSpec(
+      cmdline=[cmd],
+      shortname='qps_driver.%s' % scenario_name,
+      timeout_seconds=3*60,
+      shell=True,
+      verbose_success=True)
+
+
+def archive_repo():
+  """Archives local version of repo including submodules."""
+  # TODO: also archive grpc-go and grpc-java repos
+  archive_job = jobset.JobSpec(
+      cmdline=['tar', '-cf', '../grpc.tar', '../grpc/'],
+      shortname='archive_repo',
+      timeout_seconds=3*60)
+
+  jobset.message('START', 'Archiving local repository.', do_newline=True)
+  num_failures, _ = jobset.run(
+      [archive_job], newline_on_success=True, maxjobs=1)
+  if num_failures == 0:
+    jobset.message('SUCCESS',
+                   'Archive with local repository create successfully.',
+                   do_newline=True)
+  else:
+    jobset.message('FAILED', 'Failed to archive local repository.',
+                   do_newline=True)
+    sys.exit(1)
+
+
+def prepare_remote_hosts(hosts):
+  """Prepares remote hosts."""
+  prepare_jobs = []
+  for host in hosts:
+    user_at_host = '%s@%s' % (_REMOTE_HOST_USERNAME, host)
+    prepare_jobs.append(
+        jobset.JobSpec(
+            cmdline=['tools/run_tests/performance/remote_host_prepare.sh'],
+            shortname='remote_host_prepare.%s' % host,
+            environ = {'USER_AT_HOST': user_at_host},
+            timeout_seconds=3*60))
+  jobset.message('START', 'Preparing remote hosts.', do_newline=True)
+  num_failures, _ = jobset.run(
+      prepare_jobs, newline_on_success=True, maxjobs=10)
+  if num_failures == 0:
+    jobset.message('SUCCESS',
+                   'Remote hosts ready to start build.',
+                   do_newline=True)
+  else:
+    jobset.message('FAILED', 'Failed to prepare remote hosts.',
+                   do_newline=True)
+    sys.exit(1)
+
+
+def build_on_remote_hosts(hosts, build_local=False):
+  """Builds performance worker on remote hosts."""
+  build_timeout = 15*60
+  build_jobs = []
+  for host in hosts:
+    user_at_host = '%s@%s' % (_REMOTE_HOST_USERNAME, host)
+    build_jobs.append(
+        jobset.JobSpec(
+            cmdline=['tools/run_tests/performance/remote_host_build.sh'],
+            shortname='remote_host_build.%s' % host,
+            environ = {'USER_AT_HOST': user_at_host, 'CONFIG': 'opt'},
+            timeout_seconds=build_timeout))
+  if build_local:
+    # Build locally as well
+    build_jobs.append(
+        jobset.JobSpec(
+            cmdline=['tools/run_tests/performance/build_performance.sh'],
+            shortname='local_build',
+            environ = {'CONFIG': 'opt'},
+            timeout_seconds=build_timeout))
+  jobset.message('START', 'Building on remote hosts.', do_newline=True)
+  num_failures, _ = jobset.run(
+      build_jobs, newline_on_success=True, maxjobs=10)
+  if num_failures == 0:
+    jobset.message('SUCCESS',
+                   'Build on remote hosts was successful.',
+                   do_newline=True)
+  else:
+    jobset.message('FAILED', 'Failed to build on remote hosts.',
+                   do_newline=True)
+    sys.exit(1)
+
+
+def start_qpsworkers(worker_hosts):
+  """Starts QPS workers as background jobs."""
+  if not worker_hosts:
+    # run two workers locally
+    workers=[(None, 10000), (None, 10010)]
+  elif len(worker_hosts) == 1:
+    # run two workers on the remote host
+    workers=[(worker_hosts[0], 10000), (worker_hosts[0], 10010)]
+  else:
+    # run one worker per each remote host
+    workers=[(worker_host, 10000) for worker_host in worker_hosts]
+
+  return [create_qpsworker_job(CXXLanguage(),
+                               port=worker[1],
+                               remote_host=worker[0])
+          for worker in workers]
+
+
+def create_scenarios(languages, workers, remote_host=None):
+  """Create jobspecs for scenarios to run."""
+  scenarios = []
+  for language in languages:
+    for scenario_name, driver_args in language.scenarios().iteritems():
+      scenario = create_scenario_jobspec(scenario_name,
+                                         driver_args,
+                                         workers,
+                                         remote_host=remote_host)
+      scenarios.append(scenario)
+
+  # the very last scenario requests shutting down the workers.
+  scenarios.append(create_scenario_jobspec('quit_workers',
+                                           ['--quit=true'],
+                                           workers,
+                                           remote_host=remote_host))
+  return scenarios
+
+
+def finish_qps_workers(jobs):
+  """Waits for given jobs to finish and eventually kills them."""
+  retries = 0
+  while any(job.is_running() for job in jobs):
+    for job in qpsworker_jobs:
+      if job.is_running():
+        print 'QPS worker "%s" is still running.' % job.host_and_port
+    if retries > 10:
+      print 'Killing all QPS workers.'
+      for job in jobs:
+        job.kill()
+    retries += 1
+    time.sleep(3)
+  print 'All QPS workers finished.'
+
+
+argp = argparse.ArgumentParser(description='Run performance tests.')
+argp.add_argument('--remote_driver_host',
+                  default=None,
+                  help='Run QPS driver on given host. By default, QPS driver is run locally.')
+argp.add_argument('--remote_worker_host',
+                  nargs='+',
+                  default=[],
+                  help='Worker hosts where to start QPS workers.')
+
+args = argp.parse_args()
+
+# Put together set of remote hosts where to run and build
+remote_hosts = set()
+if args.remote_worker_host:
+  for host in args.remote_worker_host:
+    remote_hosts.add(host)
+if args.remote_driver_host:
+  remote_hosts.add(args.remote_driver_host)
+
+if remote_hosts:
+  archive_repo()
+  prepare_remote_hosts(remote_hosts)
+
+build_local = False
+if not args.remote_driver_host:
+  build_local = True
+build_on_remote_hosts(remote_hosts, build_local=build_local)
+
+qpsworker_jobs = start_qpsworkers(args.remote_worker_host)
+
+worker_addresses = [job.host_and_port for job in qpsworker_jobs]
+
+try:
+  scenarios = create_scenarios(languages=[CXXLanguage()],
+                               workers=worker_addresses,
+                               remote_host=args.remote_driver_host)
+  if not scenarios:
+    raise Exception('No scenarios to run')
+
+  jobset.message('START', 'Running scenarios.', do_newline=True)
+  num_failures, _ = jobset.run(
+      scenarios, newline_on_success=True, maxjobs=1)
+  if num_failures == 0:
+    jobset.message('SUCCESS',
+                   'All scenarios finished successfully.',
+                   do_newline=True)
+  else:
+    jobset.message('FAILED', 'Some of the scenarios failed.',
+                   do_newline=True)
+    sys.exit(1)
+finally:
+  finish_qps_workers(qpsworker_jobs)
diff --git a/tools/run_tests/sources_and_headers.json b/tools/run_tests/sources_and_headers.json
index d7c9839d5a5517ab715c8be2fe3690cf4addedd7..4bad249f41f58884de7d4dccc0a31ff0b5409ef1 100644
--- a/tools/run_tests/sources_and_headers.json
+++ b/tools/run_tests/sources_and_headers.json
@@ -1026,6 +1026,54 @@
     "third_party": false, 
     "type": "target"
   }, 
+  {
+    "deps": [
+      "gpr", 
+      "gpr_test_util", 
+      "grpc", 
+      "grpc_test_util"
+    ], 
+    "headers": [], 
+    "language": "c", 
+    "name": "internal_api_canary_iomgr_test", 
+    "src": [
+      "test/core/internal_api_canaries/iomgr.c"
+    ], 
+    "third_party": false, 
+    "type": "target"
+  }, 
+  {
+    "deps": [
+      "gpr", 
+      "gpr_test_util", 
+      "grpc", 
+      "grpc_test_util"
+    ], 
+    "headers": [], 
+    "language": "c", 
+    "name": "internal_api_canary_support_test", 
+    "src": [
+      "test/core/internal_api_canaries/iomgr.c"
+    ], 
+    "third_party": false, 
+    "type": "target"
+  }, 
+  {
+    "deps": [
+      "gpr", 
+      "gpr_test_util", 
+      "grpc", 
+      "grpc_test_util"
+    ], 
+    "headers": [], 
+    "language": "c", 
+    "name": "internal_api_canary_transport_test", 
+    "src": [
+      "test/core/internal_api_canaries/iomgr.c"
+    ], 
+    "third_party": false, 
+    "type": "target"
+  }, 
   {
     "deps": [
       "gpr", 
@@ -3988,6 +4036,8 @@
       "include/grpc/impl/codegen/propagation_bits.h", 
       "include/grpc/impl/codegen/status.h", 
       "include/grpc/status.h", 
+      "src/core/ext/lb_policy/grpclb/load_balancer_api.h", 
+      "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h", 
       "src/core/ext/transport/chttp2/transport/alpn.h", 
       "src/core/ext/transport/chttp2/transport/bin_encoder.h", 
       "src/core/ext/transport/chttp2/transport/chttp2_transport.h", 
@@ -4027,9 +4077,6 @@
       "src/core/lib/client_config/client_config.h", 
       "src/core/lib/client_config/connector.h", 
       "src/core/lib/client_config/initial_connect_string.h", 
-      "src/core/lib/client_config/lb_policies/load_balancer_api.h", 
-      "src/core/lib/client_config/lb_policies/pick_first.h", 
-      "src/core/lib/client_config/lb_policies/round_robin.h", 
       "src/core/lib/client_config/lb_policy.h", 
       "src/core/lib/client_config/lb_policy_factory.h", 
       "src/core/lib/client_config/lb_policy_registry.h", 
@@ -4089,7 +4136,6 @@
       "src/core/lib/json/json_common.h", 
       "src/core/lib/json/json_reader.h", 
       "src/core/lib/json/json_writer.h", 
-      "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h", 
       "src/core/lib/security/auth_filters.h", 
       "src/core/lib/security/b64.h", 
       "src/core/lib/security/credentials.h", 
@@ -4146,6 +4192,12 @@
       "include/grpc/impl/codegen/propagation_bits.h", 
       "include/grpc/impl/codegen/status.h", 
       "include/grpc/status.h", 
+      "src/core/ext/lb_policy/grpclb/load_balancer_api.c", 
+      "src/core/ext/lb_policy/grpclb/load_balancer_api.h", 
+      "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c", 
+      "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h", 
+      "src/core/ext/lb_policy/pick_first/pick_first.c", 
+      "src/core/ext/lb_policy/round_robin/round_robin.c", 
       "src/core/ext/transport/chttp2/client/insecure/channel_create.c", 
       "src/core/ext/transport/chttp2/client/secure/secure_channel_create.c", 
       "src/core/ext/transport/chttp2/server/insecure/server_chttp2.c", 
@@ -4232,12 +4284,6 @@
       "src/core/lib/client_config/default_initial_connect_string.c", 
       "src/core/lib/client_config/initial_connect_string.c", 
       "src/core/lib/client_config/initial_connect_string.h", 
-      "src/core/lib/client_config/lb_policies/load_balancer_api.c", 
-      "src/core/lib/client_config/lb_policies/load_balancer_api.h", 
-      "src/core/lib/client_config/lb_policies/pick_first.c", 
-      "src/core/lib/client_config/lb_policies/pick_first.h", 
-      "src/core/lib/client_config/lb_policies/round_robin.c", 
-      "src/core/lib/client_config/lb_policies/round_robin.h", 
       "src/core/lib/client_config/lb_policy.c", 
       "src/core/lib/client_config/lb_policy.h", 
       "src/core/lib/client_config/lb_policy_factory.c", 
@@ -4362,8 +4408,6 @@
       "src/core/lib/json/json_string.c", 
       "src/core/lib/json/json_writer.c", 
       "src/core/lib/json/json_writer.h", 
-      "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c", 
-      "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h", 
       "src/core/lib/security/auth_filters.h", 
       "src/core/lib/security/b64.c", 
       "src/core/lib/security/b64.h", 
@@ -4443,7 +4487,8 @@
       "src/core/lib/tsi/ssl_types.h", 
       "src/core/lib/tsi/transport_security.c", 
       "src/core/lib/tsi/transport_security.h", 
-      "src/core/lib/tsi/transport_security_interface.h"
+      "src/core/lib/tsi/transport_security_interface.h", 
+      "src/core/plugin_registry/grpc_plugin_registry.c"
     ], 
     "third_party": false, 
     "type": "lib"
@@ -4616,6 +4661,8 @@
       "include/grpc/impl/codegen/propagation_bits.h", 
       "include/grpc/impl/codegen/status.h", 
       "include/grpc/status.h", 
+      "src/core/ext/lb_policy/grpclb/load_balancer_api.h", 
+      "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h", 
       "src/core/ext/transport/chttp2/transport/alpn.h", 
       "src/core/ext/transport/chttp2/transport/bin_encoder.h", 
       "src/core/ext/transport/chttp2/transport/chttp2_transport.h", 
@@ -4655,9 +4702,6 @@
       "src/core/lib/client_config/client_config.h", 
       "src/core/lib/client_config/connector.h", 
       "src/core/lib/client_config/initial_connect_string.h", 
-      "src/core/lib/client_config/lb_policies/load_balancer_api.h", 
-      "src/core/lib/client_config/lb_policies/pick_first.h", 
-      "src/core/lib/client_config/lb_policies/round_robin.h", 
       "src/core/lib/client_config/lb_policy.h", 
       "src/core/lib/client_config/lb_policy_factory.h", 
       "src/core/lib/client_config/lb_policy_registry.h", 
@@ -4717,7 +4761,6 @@
       "src/core/lib/json/json_common.h", 
       "src/core/lib/json/json_reader.h", 
       "src/core/lib/json/json_writer.h", 
-      "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h", 
       "src/core/lib/statistics/census_interface.h", 
       "src/core/lib/statistics/census_rpc_stats.h", 
       "src/core/lib/surface/api_trace.h", 
@@ -4759,6 +4802,12 @@
       "include/grpc/impl/codegen/propagation_bits.h", 
       "include/grpc/impl/codegen/status.h", 
       "include/grpc/status.h", 
+      "src/core/ext/lb_policy/grpclb/load_balancer_api.c", 
+      "src/core/ext/lb_policy/grpclb/load_balancer_api.h", 
+      "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.c", 
+      "src/core/ext/lb_policy/grpclb/proto/grpc/lb/v0/load_balancer.pb.h", 
+      "src/core/ext/lb_policy/pick_first/pick_first.c", 
+      "src/core/ext/lb_policy/round_robin/round_robin.c", 
       "src/core/ext/transport/chttp2/client/insecure/channel_create.c", 
       "src/core/ext/transport/chttp2/server/insecure/server_chttp2.c", 
       "src/core/ext/transport/chttp2/transport/alpn.c", 
@@ -4843,12 +4892,6 @@
       "src/core/lib/client_config/default_initial_connect_string.c", 
       "src/core/lib/client_config/initial_connect_string.c", 
       "src/core/lib/client_config/initial_connect_string.h", 
-      "src/core/lib/client_config/lb_policies/load_balancer_api.c", 
-      "src/core/lib/client_config/lb_policies/load_balancer_api.h", 
-      "src/core/lib/client_config/lb_policies/pick_first.c", 
-      "src/core/lib/client_config/lb_policies/pick_first.h", 
-      "src/core/lib/client_config/lb_policies/round_robin.c", 
-      "src/core/lib/client_config/lb_policies/round_robin.h", 
       "src/core/lib/client_config/lb_policy.c", 
       "src/core/lib/client_config/lb_policy.h", 
       "src/core/lib/client_config/lb_policy_factory.c", 
@@ -4972,8 +5015,6 @@
       "src/core/lib/json/json_string.c", 
       "src/core/lib/json/json_writer.c", 
       "src/core/lib/json/json_writer.h", 
-      "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c", 
-      "src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h", 
       "src/core/lib/statistics/census_interface.h", 
       "src/core/lib/statistics/census_rpc_stats.h", 
       "src/core/lib/surface/alarm.c", 
@@ -5022,7 +5063,8 @@
       "src/core/lib/transport/transport.c", 
       "src/core/lib/transport/transport.h", 
       "src/core/lib/transport/transport_impl.h", 
-      "src/core/lib/transport/transport_op_string.c"
+      "src/core/lib/transport/transport_op_string.c", 
+      "src/core/plugin_registry/grpc_unsecure_plugin_registry.c"
     ], 
     "third_party": false, 
     "type": "lib"
@@ -6579,6 +6621,7 @@
       "test/core/end2end/tests/graceful_server_shutdown.c", 
       "test/core/end2end/tests/high_initial_seqno.c", 
       "test/core/end2end/tests/hpack_size.c", 
+      "test/core/end2end/tests/idempotent_request.c", 
       "test/core/end2end/tests/invoke_large_request.c", 
       "test/core/end2end/tests/large_metadata.c", 
       "test/core/end2end/tests/max_concurrent_streams.c", 
@@ -6635,6 +6678,7 @@
       "test/core/end2end/tests/graceful_server_shutdown.c", 
       "test/core/end2end/tests/high_initial_seqno.c", 
       "test/core/end2end/tests/hpack_size.c", 
+      "test/core/end2end/tests/idempotent_request.c", 
       "test/core/end2end/tests/invoke_large_request.c", 
       "test/core/end2end/tests/large_metadata.c", 
       "test/core/end2end/tests/max_concurrent_streams.c", 
diff --git a/tools/run_tests/tests.json b/tools/run_tests/tests.json
index 5f72b8c5828c50937359a3079a5479fb858a2221..e516543daed195227b177f7cf8f1a8fdc463e6ea 100644
--- a/tools/run_tests/tests.json
+++ b/tools/run_tests/tests.json
@@ -4649,6 +4649,28 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_census_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -5441,6 +5463,28 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_compress_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -6216,6 +6260,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_fakesec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -6989,6 +7054,28 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -7679,6 +7766,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full+pipe_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -8255,6 +8358,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full+poll_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -8831,6 +8950,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full+poll+pipe_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -9487,6 +9622,28 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full+trace_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -10262,6 +10419,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_oauth2_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -10955,6 +11133,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_proxy_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -11585,6 +11784,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_sockpair_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -12215,6 +12435,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_sockpair+trace_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -12866,6 +13107,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_sockpair_1byte_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -13599,7 +13861,7 @@
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "idempotent_request"
     ], 
     "ci_platforms": [
       "windows", 
@@ -13621,7 +13883,7 @@
   }, 
   {
     "args": [
-      "large_metadata"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
       "windows", 
@@ -13643,7 +13905,7 @@
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "large_metadata"
     ], 
     "ci_platforms": [
       "windows", 
@@ -13665,7 +13927,29 @@
   }, 
   {
     "args": [
-      "max_message_length"
+      "max_concurrent_streams"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_ssl_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
+  {
+    "args": [
+      "max_message_length"
     ], 
     "ci_platforms": [
       "windows", 
@@ -14287,6 +14571,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_ssl+poll_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -14885,6 +15185,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_ssl_proxy_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -15541,6 +15862,26 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -16177,6 +16518,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds+poll_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -16833,6 +17190,28 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_census_nosec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -17603,6 +17982,28 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_compress_nosec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -18373,6 +18774,28 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full_nosec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -19047,6 +19470,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full+pipe_nosec_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -19607,6 +20046,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full+poll_nosec_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -20167,6 +20622,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full+poll+pipe_nosec_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -20801,6 +21272,28 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_full+trace_nosec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -21492,6 +21985,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_proxy_nosec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -22101,6 +22615,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_sockpair_nosec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -22710,6 +23245,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_sockpair+trace_nosec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -23340,6 +23896,27 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "windows", 
+      "linux", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_sockpair_1byte_nosec_test", 
+    "platforms": [
+      "windows", 
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -23997,6 +24574,26 @@
       "posix"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux", 
+      "mac", 
+      "posix"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_nosec_test", 
+    "platforms": [
+      "linux", 
+      "mac", 
+      "posix"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
@@ -24617,6 +25214,22 @@
       "linux"
     ]
   }, 
+  {
+    "args": [
+      "idempotent_request"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds+poll_nosec_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
   {
     "args": [
       "invoke_large_request"
diff --git a/vsprojects/buildtests_c.sln b/vsprojects/buildtests_c.sln
index 96dc4eb10740fd3776d24b9af95a06f464fec5c9..f736c86739c458e853c0199bc0235e0b6979f080 100644
--- a/vsprojects/buildtests_c.sln
+++ b/vsprojects/buildtests_c.sln
@@ -696,6 +696,39 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "init_test", "vcxproj\test\i
 		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792} = {B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}
 	EndProjectSection
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "internal_api_canary_iomgr_test", "vcxproj\test\internal_api_canary_iomgr_test\internal_api_canary_iomgr_test.vcxproj", "{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}"
+	ProjectSection(myProperties) = preProject
+        	lib = "False"
+	EndProjectSection
+	ProjectSection(ProjectDependencies) = postProject
+		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B} = {17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}
+		{29D16885-7228-4C31-81ED-5F9187C7F2A9} = {29D16885-7228-4C31-81ED-5F9187C7F2A9}
+		{EAB0A629-17A9-44DB-B5FF-E91A721FE037} = {EAB0A629-17A9-44DB-B5FF-E91A721FE037}
+		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792} = {B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "internal_api_canary_support_test", "vcxproj\test\internal_api_canary_support_test\internal_api_canary_support_test.vcxproj", "{D53575C6-713C-E6E3-FD74-E65F20916498}"
+	ProjectSection(myProperties) = preProject
+        	lib = "False"
+	EndProjectSection
+	ProjectSection(ProjectDependencies) = postProject
+		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B} = {17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}
+		{29D16885-7228-4C31-81ED-5F9187C7F2A9} = {29D16885-7228-4C31-81ED-5F9187C7F2A9}
+		{EAB0A629-17A9-44DB-B5FF-E91A721FE037} = {EAB0A629-17A9-44DB-B5FF-E91A721FE037}
+		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792} = {B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "internal_api_canary_transport_test", "vcxproj\test\internal_api_canary_transport_test\internal_api_canary_transport_test.vcxproj", "{ED24E700-964E-B426-6A6A-1944E2EF7BCB}"
+	ProjectSection(myProperties) = preProject
+        	lib = "False"
+	EndProjectSection
+	ProjectSection(ProjectDependencies) = postProject
+		{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B} = {17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}
+		{29D16885-7228-4C31-81ED-5F9187C7F2A9} = {29D16885-7228-4C31-81ED-5F9187C7F2A9}
+		{EAB0A629-17A9-44DB-B5FF-E91A721FE037} = {EAB0A629-17A9-44DB-B5FF-E91A721FE037}
+		{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792} = {B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}
+	EndProjectSection
+EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "invalid_call_argument_test", "vcxproj\test\invalid_call_argument_test\invalid_call_argument_test.vcxproj", "{C32CA8A3-58E6-8EB9-B72F-C295547D36A6}"
 	ProjectSection(myProperties) = preProject
         	lib = "False"
@@ -2453,6 +2486,54 @@ Global
 		{117CA7AD-C42B-9217-6C95-42A801777BC5}.Release-DLL|Win32.Build.0 = Release|Win32
 		{117CA7AD-C42B-9217-6C95-42A801777BC5}.Release-DLL|x64.ActiveCfg = Release|x64
 		{117CA7AD-C42B-9217-6C95-42A801777BC5}.Release-DLL|x64.Build.0 = Release|x64
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Debug|Win32.ActiveCfg = Debug|Win32
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Debug|x64.ActiveCfg = Debug|x64
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Release|Win32.ActiveCfg = Release|Win32
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Release|x64.ActiveCfg = Release|x64
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Debug|Win32.Build.0 = Debug|Win32
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Debug|x64.Build.0 = Debug|x64
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Release|Win32.Build.0 = Release|Win32
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Release|x64.Build.0 = Release|x64
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Debug-DLL|Win32.ActiveCfg = Debug|Win32
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Debug-DLL|Win32.Build.0 = Debug|Win32
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Debug-DLL|x64.ActiveCfg = Debug|x64
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Debug-DLL|x64.Build.0 = Debug|x64
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Release-DLL|Win32.ActiveCfg = Release|Win32
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Release-DLL|Win32.Build.0 = Release|Win32
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Release-DLL|x64.ActiveCfg = Release|x64
+		{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}.Release-DLL|x64.Build.0 = Release|x64
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Debug|Win32.ActiveCfg = Debug|Win32
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Debug|x64.ActiveCfg = Debug|x64
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Release|Win32.ActiveCfg = Release|Win32
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Release|x64.ActiveCfg = Release|x64
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Debug|Win32.Build.0 = Debug|Win32
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Debug|x64.Build.0 = Debug|x64
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Release|Win32.Build.0 = Release|Win32
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Release|x64.Build.0 = Release|x64
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Debug-DLL|Win32.ActiveCfg = Debug|Win32
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Debug-DLL|Win32.Build.0 = Debug|Win32
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Debug-DLL|x64.ActiveCfg = Debug|x64
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Debug-DLL|x64.Build.0 = Debug|x64
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Release-DLL|Win32.ActiveCfg = Release|Win32
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Release-DLL|Win32.Build.0 = Release|Win32
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Release-DLL|x64.ActiveCfg = Release|x64
+		{D53575C6-713C-E6E3-FD74-E65F20916498}.Release-DLL|x64.Build.0 = Release|x64
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Debug|Win32.ActiveCfg = Debug|Win32
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Debug|x64.ActiveCfg = Debug|x64
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Release|Win32.ActiveCfg = Release|Win32
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Release|x64.ActiveCfg = Release|x64
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Debug|Win32.Build.0 = Debug|Win32
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Debug|x64.Build.0 = Debug|x64
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Release|Win32.Build.0 = Release|Win32
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Release|x64.Build.0 = Release|x64
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Debug-DLL|Win32.ActiveCfg = Debug|Win32
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Debug-DLL|Win32.Build.0 = Debug|Win32
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Debug-DLL|x64.ActiveCfg = Debug|x64
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Debug-DLL|x64.Build.0 = Debug|x64
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Release-DLL|Win32.ActiveCfg = Release|Win32
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Release-DLL|Win32.Build.0 = Release|Win32
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Release-DLL|x64.ActiveCfg = Release|x64
+		{ED24E700-964E-B426-6A6A-1944E2EF7BCB}.Release-DLL|x64.Build.0 = Release|x64
 		{C32CA8A3-58E6-8EB9-B72F-C295547D36A6}.Debug|Win32.ActiveCfg = Debug|Win32
 		{C32CA8A3-58E6-8EB9-B72F-C295547D36A6}.Debug|x64.ActiveCfg = Debug|x64
 		{C32CA8A3-58E6-8EB9-B72F-C295547D36A6}.Release|Win32.ActiveCfg = Release|Win32
diff --git a/vsprojects/vcxproj/grpc/grpc.vcxproj b/vsprojects/vcxproj/grpc/grpc.vcxproj
index c20f8d707083a3968f3deb5b0e5c3e22f5ce9801..93d5a9b02fa4483ed5c156784b592676c120bd2a 100644
--- a/vsprojects/vcxproj/grpc/grpc.vcxproj
+++ b/vsprojects/vcxproj/grpc/grpc.vcxproj
@@ -282,6 +282,8 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc\status.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\alpn.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\bin_encoder.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\chttp2_transport.h" />
@@ -321,9 +323,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\client_config.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\connector.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\initial_connect_string.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\load_balancer_api.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\pick_first.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\round_robin.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy_factory.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy_registry.h" />
@@ -383,7 +382,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_common.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_reader.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_writer.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\proto\grpc\lb\v0\load_balancer.pb.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\security\auth_filters.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\security\b64.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\security\credentials.h" />
@@ -425,6 +423,14 @@
     <ClInclude Include="$(SolutionDir)\..\third_party\nanopb\pb_encode.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\pick_first\pick_first.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\round_robin\round_robin.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\client\insecure\channel_create.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\client\secure\secure_channel_create.c">
@@ -519,12 +525,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\initial_connect_string.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\load_balancer_api.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\pick_first.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\round_robin.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy_factory.c">
@@ -655,8 +655,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\json\json_writer.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\proto\grpc\lb\v0\load_balancer.pb.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\security\b64.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\security\client_auth_filter.c">
@@ -747,6 +745,8 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\tsi\transport_security.c">
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\plugin_registry\grpc_plugin_registry.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\third_party\nanopb\pb_common.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\third_party\nanopb\pb_decode.c">
diff --git a/vsprojects/vcxproj/grpc/grpc.vcxproj.filters b/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
index f03b20703f706a158b7690f791d7a678dd5b1401..3e5032db0e12fcba4d4e4d6c88a7d29bee5c9b2a 100644
--- a/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
@@ -1,6 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.c">
+      <Filter>src\core\ext\lb_policy\grpclb</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.c">
+      <Filter>src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\pick_first\pick_first.c">
+      <Filter>src\core\ext\lb_policy\pick_first</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\round_robin\round_robin.c">
+      <Filter>src\core\ext\lb_policy\round_robin</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\client\insecure\channel_create.c">
       <Filter>src\core\ext\transport\chttp2\client\insecure</Filter>
     </ClCompile>
@@ -142,15 +154,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\initial_connect_string.c">
       <Filter>src\core\lib\client_config</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\load_balancer_api.c">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\pick_first.c">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\round_robin.c">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy.c">
       <Filter>src\core\lib\client_config</Filter>
     </ClCompile>
@@ -346,9 +349,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\json\json_writer.c">
       <Filter>src\core\lib\json</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\proto\grpc\lb\v0\load_balancer.pb.c">
-      <Filter>src\core\lib\proto\grpc\lb\v0</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\security\b64.c">
       <Filter>src\core\lib\security</Filter>
     </ClCompile>
@@ -484,6 +484,9 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\tsi\transport_security.c">
       <Filter>src\core\lib\tsi</Filter>
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\plugin_registry\grpc_plugin_registry.c">
+      <Filter>src\core\plugin_registry</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\third_party\nanopb\pb_common.c">
       <Filter>third_party\nanopb</Filter>
     </ClCompile>
@@ -536,6 +539,12 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.h">
+      <Filter>src\core\ext\lb_policy\grpclb</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.h">
+      <Filter>src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\alpn.h">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClInclude>
@@ -653,15 +662,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\initial_connect_string.h">
       <Filter>src\core\lib\client_config</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\load_balancer_api.h">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\pick_first.h">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\round_robin.h">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy.h">
       <Filter>src\core\lib\client_config</Filter>
     </ClInclude>
@@ -839,9 +839,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_writer.h">
       <Filter>src\core\lib\json</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\proto\grpc\lb\v0\load_balancer.pb.h">
-      <Filter>src\core\lib\proto\grpc\lb\v0</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\security\auth_filters.h">
       <Filter>src\core\lib\security</Filter>
     </ClInclude>
@@ -983,6 +980,30 @@
     <Filter Include="src\core\ext">
       <UniqueIdentifier>{3f32a58f-394f-5f13-06aa-6cc52cc2daaf}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\ext\lb_policy">
+      <UniqueIdentifier>{030f00ff-6c54-76c8-12df-37e3008335d1}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb">
+      <UniqueIdentifier>{fe41339e-53fb-39b3-7457-7a0fbb238dbe}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb\proto">
+      <UniqueIdentifier>{a7c27f6b-6d15-01cf-76d9-c30dddea0990}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb\proto\grpc">
+      <UniqueIdentifier>{bc714e6d-8aba-91df-7db9-7f189f05a6ff}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb\proto\grpc\lb">
+      <UniqueIdentifier>{adf7e553-94ef-14fd-e845-03104f00a06f}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0">
+      <UniqueIdentifier>{0406d191-8817-38c3-a562-e3541201f424}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\pick_first">
+      <UniqueIdentifier>{b63ded00-b24f-708e-333f-ce199e421875}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\round_robin">
+      <UniqueIdentifier>{2472d352-cf94-f317-646e-72b769cea846}</UniqueIdentifier>
+    </Filter>
     <Filter Include="src\core\ext\transport">
       <UniqueIdentifier>{e3abfd0a-064e-0f2f-c8e8-7c5a7e98142a}</UniqueIdentifier>
     </Filter>
@@ -1022,9 +1043,6 @@
     <Filter Include="src\core\lib\client_config">
       <UniqueIdentifier>{2f3260de-be57-d18d-6882-61d115baa159}</UniqueIdentifier>
     </Filter>
-    <Filter Include="src\core\lib\client_config\lb_policies">
-      <UniqueIdentifier>{118d2bb5-086f-54f3-11de-26d7d7f73f9d}</UniqueIdentifier>
-    </Filter>
     <Filter Include="src\core\lib\client_config\resolvers">
       <UniqueIdentifier>{b9d8db6c-2c68-1c90-fe5e-37da90f47ae6}</UniqueIdentifier>
     </Filter>
@@ -1043,18 +1061,6 @@
     <Filter Include="src\core\lib\json">
       <UniqueIdentifier>{cb2b0073-f2a7-5c63-d182-8874b24bdf36}</UniqueIdentifier>
     </Filter>
-    <Filter Include="src\core\lib\proto">
-      <UniqueIdentifier>{b4b19f9a-1575-8a21-0bca-537746f858b7}</UniqueIdentifier>
-    </Filter>
-    <Filter Include="src\core\lib\proto\grpc">
-      <UniqueIdentifier>{cbc8ce67-4a97-d533-8dc3-f949c63e2771}</UniqueIdentifier>
-    </Filter>
-    <Filter Include="src\core\lib\proto\grpc\lb">
-      <UniqueIdentifier>{933530ae-447b-ea8d-3531-98f0556960b0}</UniqueIdentifier>
-    </Filter>
-    <Filter Include="src\core\lib\proto\grpc\lb\v0">
-      <UniqueIdentifier>{c33f944f-37d4-42fd-abc3-61f0d4400462}</UniqueIdentifier>
-    </Filter>
     <Filter Include="src\core\lib\security">
       <UniqueIdentifier>{c4661d64-349f-01c1-1ba8-0602f9047595}</UniqueIdentifier>
     </Filter>
@@ -1070,6 +1076,9 @@
     <Filter Include="src\core\lib\tsi">
       <UniqueIdentifier>{95ad2811-c8d0-7a42-2a73-baf03fcbf699}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\plugin_registry">
+      <UniqueIdentifier>{02bec99b-ff39-88d7-9dea-e0ff9f4a2701}</UniqueIdentifier>
+    </Filter>
     <Filter Include="third_party">
       <UniqueIdentifier>{aaab30a4-2a15-732e-c141-3fbc0f0f5a7a}</UniqueIdentifier>
     </Filter>
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
index e89cc8a1257d451684675f08537a7de7ad4ac090..98a6bee1704f1ff46ea20be1c449623e161afc16 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
@@ -272,6 +272,8 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc\status.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\alpn.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\bin_encoder.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\chttp2_transport.h" />
@@ -311,9 +313,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\client_config.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\connector.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\initial_connect_string.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\load_balancer_api.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\pick_first.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\round_robin.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy_factory.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy_registry.h" />
@@ -373,7 +372,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_common.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_reader.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_writer.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\proto\grpc\lb\v0\load_balancer.pb.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_interface.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_rpc_stats.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\api_trace.h" />
@@ -401,6 +399,14 @@
     <ClInclude Include="$(SolutionDir)\..\third_party\nanopb\pb_encode.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\pick_first\pick_first.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\round_robin\round_robin.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\client\insecure\channel_create.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\server\insecure\server_chttp2.c">
@@ -491,12 +497,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\initial_connect_string.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\load_balancer_api.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\pick_first.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\round_robin.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy_factory.c">
@@ -625,8 +625,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\json\json_writer.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\proto\grpc\lb\v0\load_balancer.pb.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\surface\alarm.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\surface\api_trace.c">
@@ -683,6 +681,8 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\transport_op_string.c">
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\plugin_registry\grpc_unsecure_plugin_registry.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\third_party\nanopb\pb_common.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\third_party\nanopb\pb_decode.c">
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
index c9f1ad69433102a5139f07b3cb40d33fd5350e69..81c8a874fc9fd929db31788656f7aeb00e118346 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -1,6 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.c">
+      <Filter>src\core\ext\lb_policy\grpclb</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.c">
+      <Filter>src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\pick_first\pick_first.c">
+      <Filter>src\core\ext\lb_policy\pick_first</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\round_robin\round_robin.c">
+      <Filter>src\core\ext\lb_policy\round_robin</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\client\insecure\channel_create.c">
       <Filter>src\core\ext\transport\chttp2\client\insecure</Filter>
     </ClCompile>
@@ -136,15 +148,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\initial_connect_string.c">
       <Filter>src\core\lib\client_config</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\load_balancer_api.c">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\pick_first.c">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\round_robin.c">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy.c">
       <Filter>src\core\lib\client_config</Filter>
     </ClCompile>
@@ -337,9 +340,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\json\json_writer.c">
       <Filter>src\core\lib\json</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\proto\grpc\lb\v0\load_balancer.pb.c">
-      <Filter>src\core\lib\proto\grpc\lb\v0</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\surface\alarm.c">
       <Filter>src\core\lib\surface</Filter>
     </ClCompile>
@@ -424,6 +424,9 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\transport\transport_op_string.c">
       <Filter>src\core\lib\transport</Filter>
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\plugin_registry\grpc_unsecure_plugin_registry.c">
+      <Filter>src\core\plugin_registry</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\third_party\nanopb\pb_common.c">
       <Filter>third_party\nanopb</Filter>
     </ClCompile>
@@ -473,6 +476,12 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.h">
+      <Filter>src\core\ext\lb_policy\grpclb</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.h">
+      <Filter>src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\alpn.h">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClInclude>
@@ -590,15 +599,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\initial_connect_string.h">
       <Filter>src\core\lib\client_config</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\load_balancer_api.h">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\pick_first.h">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policies\round_robin.h">
-      <Filter>src\core\lib\client_config\lb_policies</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\client_config\lb_policy.h">
       <Filter>src\core\lib\client_config</Filter>
     </ClInclude>
@@ -776,9 +776,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_writer.h">
       <Filter>src\core\lib\json</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\proto\grpc\lb\v0\load_balancer.pb.h">
-      <Filter>src\core\lib\proto\grpc\lb\v0</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_interface.h">
       <Filter>src\core\lib\statistics</Filter>
     </ClInclude>
@@ -878,6 +875,30 @@
     <Filter Include="src\core\ext">
       <UniqueIdentifier>{82f86e8c-00a4-f566-d235-670fc629798d}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\ext\lb_policy">
+      <UniqueIdentifier>{a23781d2-27e4-7cb0-12cd-59782ecb21ce}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb">
+      <UniqueIdentifier>{25a465c8-d1e8-6248-c005-bb2062206472}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb\proto">
+      <UniqueIdentifier>{40fc2615-d244-0d36-4486-ba6f0fa468bb}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb\proto\grpc">
+      <UniqueIdentifier>{1d129f24-a399-12ef-68de-023aff7dde52}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb\proto\grpc\lb">
+      <UniqueIdentifier>{21858d9d-30b5-8847-5882-6b47df0fa293}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0">
+      <UniqueIdentifier>{1795a20b-3e7c-e27d-eae1-96582fa9a958}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\pick_first">
+      <UniqueIdentifier>{e27f9ecf-97bb-1a2e-3135-a41f732dcf55}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="src\core\ext\lb_policy\round_robin">
+      <UniqueIdentifier>{e5fc1091-5d60-404f-775b-686ef4b3266f}</UniqueIdentifier>
+    </Filter>
     <Filter Include="src\core\ext\transport">
       <UniqueIdentifier>{967c89fe-c97c-27e2-aac0-9ba5854cb5fa}</UniqueIdentifier>
     </Filter>
@@ -911,9 +932,6 @@
     <Filter Include="src\core\lib\client_config">
       <UniqueIdentifier>{29ca2974-89e4-1a74-3e4d-0d63e2f77566}</UniqueIdentifier>
     </Filter>
-    <Filter Include="src\core\lib\client_config\lb_policies">
-      <UniqueIdentifier>{6c7e36d4-6117-e0cd-c886-b9eb3c994927}</UniqueIdentifier>
-    </Filter>
     <Filter Include="src\core\lib\client_config\resolvers">
       <UniqueIdentifier>{2d959ef9-9703-dc92-a56f-9fe136dadfb9}</UniqueIdentifier>
     </Filter>
@@ -932,18 +950,6 @@
     <Filter Include="src\core\lib\json">
       <UniqueIdentifier>{681cdaeb-c47f-8853-d985-bf13c2873947}</UniqueIdentifier>
     </Filter>
-    <Filter Include="src\core\lib\proto">
-      <UniqueIdentifier>{4bfbd6c6-f6a8-c6b3-5186-b788f4e11e23}</UniqueIdentifier>
-    </Filter>
-    <Filter Include="src\core\lib\proto\grpc">
-      <UniqueIdentifier>{60f3ab7d-ea44-348f-671e-77fdebbd18bb}</UniqueIdentifier>
-    </Filter>
-    <Filter Include="src\core\lib\proto\grpc\lb">
-      <UniqueIdentifier>{bcd33510-32e7-c2fb-e11d-a3655f97bc84}</UniqueIdentifier>
-    </Filter>
-    <Filter Include="src\core\lib\proto\grpc\lb\v0">
-      <UniqueIdentifier>{bb9b8c80-9eff-5ab6-5b29-c2d54f0fc192}</UniqueIdentifier>
-    </Filter>
     <Filter Include="src\core\lib\statistics">
       <UniqueIdentifier>{d0ab6d54-ae25-fc49-3656-91d9db57366a}</UniqueIdentifier>
     </Filter>
@@ -953,6 +959,9 @@
     <Filter Include="src\core\lib\transport">
       <UniqueIdentifier>{6c3394d1-27e9-003e-19ed-8116d210f7cc}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\plugin_registry">
+      <UniqueIdentifier>{babf0a90-e934-f599-5475-e6937d9580fe}</UniqueIdentifier>
+    </Filter>
     <Filter Include="third_party">
       <UniqueIdentifier>{025c051e-8eba-125b-67f9-173f95176eb2}</UniqueIdentifier>
     </Filter>
diff --git a/vsprojects/vcxproj/test/end2end/tests/end2end_nosec_tests/end2end_nosec_tests.vcxproj b/vsprojects/vcxproj/test/end2end/tests/end2end_nosec_tests/end2end_nosec_tests.vcxproj
index 568a0515aaea163ac5b9217557ea0e13740fa0cf..d54d21b66e35ca526f25e4515d8e4a805eadf295 100644
--- a/vsprojects/vcxproj/test/end2end/tests/end2end_nosec_tests/end2end_nosec_tests.vcxproj
+++ b/vsprojects/vcxproj/test/end2end/tests/end2end_nosec_tests/end2end_nosec_tests.vcxproj
@@ -185,6 +185,8 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\hpack_size.c">
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\idempotent_request.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\invoke_large_request.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\large_metadata.c">
diff --git a/vsprojects/vcxproj/test/end2end/tests/end2end_nosec_tests/end2end_nosec_tests.vcxproj.filters b/vsprojects/vcxproj/test/end2end/tests/end2end_nosec_tests/end2end_nosec_tests.vcxproj.filters
index ecc23e868dac58ff82c7db37e01bcff88fd85ee4..99622e228d62f8a9da251c1d5af9e794c9bc5516 100644
--- a/vsprojects/vcxproj/test/end2end/tests/end2end_nosec_tests/end2end_nosec_tests.vcxproj.filters
+++ b/vsprojects/vcxproj/test/end2end/tests/end2end_nosec_tests/end2end_nosec_tests.vcxproj.filters
@@ -52,6 +52,9 @@
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\hpack_size.c">
       <Filter>test\core\end2end\tests</Filter>
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\idempotent_request.c">
+      <Filter>test\core\end2end\tests</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\invoke_large_request.c">
       <Filter>test\core\end2end\tests</Filter>
     </ClCompile>
diff --git a/vsprojects/vcxproj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj b/vsprojects/vcxproj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj
index 3e0092ef87476951c71dc5c351d1486241399a3c..c0b21c9ae149b4edb48eedaf30e83f29ee09eca8 100644
--- a/vsprojects/vcxproj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj
+++ b/vsprojects/vcxproj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj
@@ -187,6 +187,8 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\hpack_size.c">
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\idempotent_request.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\invoke_large_request.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\large_metadata.c">
diff --git a/vsprojects/vcxproj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj.filters b/vsprojects/vcxproj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj.filters
index c3aabc48a03f3dd743311f2fb80702070ee70725..791589863e050119015537eae84c5a7b2fa25c8c 100644
--- a/vsprojects/vcxproj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj.filters
+++ b/vsprojects/vcxproj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj.filters
@@ -55,6 +55,9 @@
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\hpack_size.c">
       <Filter>test\core\end2end\tests</Filter>
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\idempotent_request.c">
+      <Filter>test\core\end2end\tests</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\test\core\end2end\tests\invoke_large_request.c">
       <Filter>test\core\end2end\tests</Filter>
     </ClCompile>
diff --git a/vsprojects/vcxproj/test/internal_api_canary_iomgr_test/internal_api_canary_iomgr_test.vcxproj b/vsprojects/vcxproj/test/internal_api_canary_iomgr_test/internal_api_canary_iomgr_test.vcxproj
new file mode 100644
index 0000000000000000000000000000000000000000..11d89a01c15d7dc7817bee49bc3d1db44a7f98d9
--- /dev/null
+++ b/vsprojects/vcxproj/test/internal_api_canary_iomgr_test/internal_api_canary_iomgr_test.vcxproj
@@ -0,0 +1,199 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.props" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\1.0.204.1.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{28AE726B-1BFB-202B-48D2-41AF9D09B9EA}</ProjectGuid>
+    <IgnoreWarnIntDirInTempDetected>true</IgnoreWarnIntDirInTempDetected>
+    <IntDir>$(SolutionDir)IntDir\$(MSBuildProjectName)\</IntDir>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '10.0'" Label="Configuration">
+    <PlatformToolset>v100</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '11.0'" Label="Configuration">
+    <PlatformToolset>v110</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '12.0'" Label="Configuration">
+    <PlatformToolset>v120</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '14.0'" Label="Configuration">
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="$(SolutionDir)\..\vsprojects\global.props" />
+    <Import Project="$(SolutionDir)\..\vsprojects\openssl.props" />
+    <Import Project="$(SolutionDir)\..\vsprojects\winsock.props" />
+    <Import Project="$(SolutionDir)\..\vsprojects\zlib.props" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'">
+    <TargetName>internal_api_canary_iomgr_test</TargetName>
+    <Linkage-grpc_dependencies_zlib>static</Linkage-grpc_dependencies_zlib>
+    <Configuration-grpc_dependencies_zlib>Debug</Configuration-grpc_dependencies_zlib>
+    <Linkage-grpc_dependencies_openssl>static</Linkage-grpc_dependencies_openssl>
+    <Configuration-grpc_dependencies_openssl>Debug</Configuration-grpc_dependencies_openssl>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Release'">
+    <TargetName>internal_api_canary_iomgr_test</TargetName>
+    <Linkage-grpc_dependencies_zlib>static</Linkage-grpc_dependencies_zlib>
+    <Configuration-grpc_dependencies_zlib>Release</Configuration-grpc_dependencies_zlib>
+    <Linkage-grpc_dependencies_openssl>static</Linkage-grpc_dependencies_openssl>
+    <Configuration-grpc_dependencies_openssl>Release</Configuration-grpc_dependencies_openssl>
+  </PropertyGroup>
+    <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <DebugInformationFormat Condition="$(Jenkins)">None</DebugInformationFormat>
+      <MinimalRebuild Condition="$(Jenkins)">false</MinimalRebuild>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation Condition="!$(Jenkins)">true</GenerateDebugInformation>
+      <GenerateDebugInformation Condition="$(Jenkins)">false</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+
+    <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <DebugInformationFormat Condition="$(Jenkins)">None</DebugInformationFormat>
+      <MinimalRebuild Condition="$(Jenkins)">false</MinimalRebuild>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation Condition="!$(Jenkins)">true</GenerateDebugInformation>
+      <GenerateDebugInformation Condition="$(Jenkins)">false</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+
+    <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <DebugInformationFormat Condition="$(Jenkins)">None</DebugInformationFormat>
+      <MinimalRebuild Condition="$(Jenkins)">false</MinimalRebuild>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation Condition="!$(Jenkins)">true</GenerateDebugInformation>
+      <GenerateDebugInformation Condition="$(Jenkins)">false</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
+
+    <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <DebugInformationFormat Condition="$(Jenkins)">None</DebugInformationFormat>
+      <MinimalRebuild Condition="$(Jenkins)">false</MinimalRebuild>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation Condition="!$(Jenkins)">true</GenerateDebugInformation>
+      <GenerateDebugInformation Condition="$(Jenkins)">false</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
+
+  <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\test\core\internal_api_canaries\iomgr.c">
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="$(SolutionDir)\..\vsprojects\vcxproj\.\grpc_test_util\grpc_test_util.vcxproj">
+      <Project>{17BCAFC0-5FDC-4C94-AEB9-95F3E220614B}</Project>
+    </ProjectReference>
+    <ProjectReference Include="$(SolutionDir)\..\vsprojects\vcxproj\.\grpc\grpc.vcxproj">
+      <Project>{29D16885-7228-4C31-81ED-5F9187C7F2A9}</Project>
+    </ProjectReference>
+    <ProjectReference Include="$(SolutionDir)\..\vsprojects\vcxproj\.\gpr_test_util\gpr_test_util.vcxproj">
+      <Project>{EAB0A629-17A9-44DB-B5FF-E91A721FE037}</Project>
+    </ProjectReference>
+    <ProjectReference Include="$(SolutionDir)\..\vsprojects\vcxproj\.\gpr\gpr.vcxproj">
+      <Project>{B23D3D1A-9438-4EDA-BEB6-9A0A03D17792}</Project>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  <Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.redist.1.2.8.10\build\native\grpc.dependencies.zlib.redist.targets" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.redist.1.2.8.10\build\native\grpc.dependencies\grpc.dependencies.zlib.targets')" />
+  <Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.1.2.8.10\build\native\grpc.dependencies.zlib.targets" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.1.2.8.10\build\native\grpc.dependencies\grpc.dependencies.zlib.targets')" />
+  <Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.redist.1.0.204.1\build\native\grpc.dependencies.openssl.redist.targets" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.redist.1.0.204.1\build\native\grpc.dependencies\grpc.dependencies.openssl.targets')" />
+  <Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.targets" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies\grpc.dependencies.openssl.targets')" />
+  </ImportGroup>
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.redist.1.2.8.10\build\native\grpc.dependencies.zlib.redist.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.redist.1.2.8.10\build\native\grpc.dependencies.zlib.redist.targets')" />
+    <Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.1.2.8.10\build\native\grpc.dependencies.zlib.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.zlib.1.2.8.10\build\native\grpc.dependencies.zlib.targets')" />
+    <Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.redist.1.0.204.1\build\native\grpc.dependencies.openssl.redist.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.redist.1.0.204.1\build\native\grpc.dependencies.openssl.redist.targets')" />
+    <Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.props')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.props')" />
+    <Error Condition="!Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.targets')" />
+  </Target>
+</Project>
+
diff --git a/vsprojects/vcxproj/test/internal_api_canary_iomgr_test/internal_api_canary_iomgr_test.vcxproj.filters b/vsprojects/vcxproj/test/internal_api_canary_iomgr_test/internal_api_canary_iomgr_test.vcxproj.filters
new file mode 100644
index 0000000000000000000000000000000000000000..f1ee82d1f4c80bb08d8f68ac7a2b86a14463bd20
--- /dev/null
+++ b/vsprojects/vcxproj/test/internal_api_canary_iomgr_test/internal_api_canary_iomgr_test.vcxproj.filters
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\test\core\internal_api_canaries\iomgr.c">
+      <Filter>test\core\internal_api_canaries</Filter>
+    </ClCompile>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Filter Include="test">
+      <UniqueIdentifier>{881986d1-d1fe-b377-cf26-b3377af95009}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="test\core">
+      <UniqueIdentifier>{4f9a544e-5680-18ee-30d7-38179bf82cee}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="test\core\internal_api_canaries">
+      <UniqueIdentifier>{6ab29f78-ec9d-d63a-8e8f-0d7552b3edd4}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+</Project>
+
diff --git a/vsprojects/vcxproj/test/internal_api_canary_support_test/internal_api_canary_support_test.vcxproj b/vsprojects/vcxproj/test/internal_api_canary_support_test/internal_api_canary_support_test.vcxproj
new file mode 100644
index 0000000000000000000000000000000000000000..59092dc2b3c9e902c489a884ac0d0e44177cee64
--- /dev/null
+++ b/vsprojects/vcxproj/test/internal_api_canary_support_test/internal_api_canary_support_test.vcxproj
@@ -0,0 +1,199 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.props" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\1.0.204.1.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{D53575C6-713C-E6E3-FD74-E65F20916498}</ProjectGuid>
+    <IgnoreWarnIntDirInTempDetected>true</IgnoreWarnIntDirInTempDetected>
+    <IntDir>$(SolutionDir)IntDir\$(MSBuildProjectName)\</IntDir>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '10.0'" Label="Configuration">
+    <PlatformToolset>v100</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '11.0'" Label="Configuration">
+    <PlatformToolset>v110</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '12.0'" Label="Configuration">
+    <PlatformToolset>v120</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '14.0'" Label="Configuration">
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="$(SolutionDir)\..\vsprojects\global.props" />
+    <Import Project="$(SolutionDir)\..\vsprojects\openssl.props" />
+    <Import Project="$(SolutionDir)\..\vsprojects\winsock.props" />
+    <Import Project="$(SolutionDir)\..\vsprojects\zlib.props" />
+  </ImportGroup>
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diff --git a/vsprojects/vcxproj/test/internal_api_canary_support_test/internal_api_canary_support_test.vcxproj.filters b/vsprojects/vcxproj/test/internal_api_canary_support_test/internal_api_canary_support_test.vcxproj.filters
new file mode 100644
index 0000000000000000000000000000000000000000..f7f4e3200ed25fa847db1a6d640efb30cedd2b4e
--- /dev/null
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@@ -0,0 +1,21 @@
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diff --git a/vsprojects/vcxproj/test/internal_api_canary_transport_test/internal_api_canary_transport_test.vcxproj b/vsprojects/vcxproj/test/internal_api_canary_transport_test/internal_api_canary_transport_test.vcxproj
new file mode 100644
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--- /dev/null
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diff --git a/vsprojects/vcxproj/test/internal_api_canary_transport_test/internal_api_canary_transport_test.vcxproj.filters b/vsprojects/vcxproj/test/internal_api_canary_transport_test/internal_api_canary_transport_test.vcxproj.filters
new file mode 100644
index 0000000000000000000000000000000000000000..1e0b4c5557e4b4c67929eeeb3b3d09c8bdcfab93
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+      <UniqueIdentifier>{79aad60f-59b8-09e2-2cad-5b5e083ac008}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="test\core\internal_api_canaries">
+      <UniqueIdentifier>{e4f0214e-e3ec-b5b8-c00b-2932b5ec2422}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+</Project>
+