Merge github.com:google/grpc into conn

.clang-format

src/compiler/cpp_generator.cc

src/compiler/cpp_generator.h

src/compiler/cpp_generator_helpers.h

src/compiler/cpp_plugin.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/channel/census_filter.c

src/core/channel/channel_stack.c

src/core/channel/child_channel.c

src/core/channel/client_channel.c

src/core/channel/connected_channel.c

src/core/channel/http_client_filter.c

src/core/channel/http_filter.c

src/core/channel/http_server_filter.c

src/core/channel/metadata_buffer.c