Merge branch 'timer_pool' into uberpoll

CMakeLists.txt

Makefile

binding.gyp

build.yaml

config.m4

gRPC-Core.podspec

grpc.gemspec

package.xml

src/core/ext/filters/client_channel/channel_connectivity.c

...core/ext/filters/client_channel/lb_policy/grpclb/grpclb.c

...ilters/client_channel/lb_policy/round_robin/round_robin.c

src/core/ext/filters/http/http_filters_plugin.c

...t/filters/http/message_compress/message_compress_filter.c

...t/filters/http/message_compress/message_compress_filter.h

src/core/ext/transport/chttp2/transport/chttp2_transport.c

src/core/ext/transport/chttp2/transport/chttp2_transport.h

src/core/ext/transport/chttp2/transport/frame_settings.c

src/core/ext/transport/chttp2/transport/hpack_parser.c

src/core/ext/transport/chttp2/transport/internal.h

src/core/ext/transport/chttp2/transport/parsing.c