Merge github.com:grpc/grpc into copyright-fix

Makefile

PYTHON-MANIFEST.in

build.yaml

include/grpc/grpc.h

include/grpc/impl/codegen/grpc_types.h

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

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

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

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

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

...core/ext/transport/chttp2/transport/frame_window_update.c

...core/ext/transport/chttp2/transport/frame_window_update.h

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

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

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

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

src/core/lib/channel/http_client_filter.c

src/core/lib/channel/http_server_filter.c