WIP. Need to merge and add more tests.

Makefile

gRPC.podspec

src/core/channel/channel_args.c

src/core/channel/channel_args.h

src/core/channel/compress_filter.c

src/core/compression/algorithm.c

src/core/surface/call.c

src/core/transport/chttp2/frame_data.c

test/core/end2end/cq_verifier.c

test/core/end2end/gen_build_json.py

test/core/end2end/tests/request_with_compressed_payload.c

tools/run_tests/tests.json

vsprojects/Grpc.mak