Merge branch 'vjpai-qps-stream' into qps-stream

examples/pubsub/main.cc

examples/pubsub/publisher.cc

examples/pubsub/publisher_test.cc

examples/pubsub/subscriber.cc

examples/pubsub/subscriber_test.cc

src/compiler/python_generator.cc

src/compiler/ruby_generator.cc

src/compiler/ruby_generator.h

src/compiler/ruby_generator_helpers-inl.h

src/compiler/ruby_generator_map-inl.h

src/compiler/ruby_generator_string-inl.h

src/compiler/ruby_plugin.cc

src/core/iomgr/iocp_windows.c

src/core/iomgr/iocp_windows.h

src/core/iomgr/iomgr.c

src/core/iomgr/socket_windows.c

src/core/iomgr/socket_windows.h

src/core/tsi/ssl_transport_security.c

src/cpp/client/insecure_credentials.cc

src/cpp/client/secure_credentials.cc