Merge branch 'master' of github.com:grpc/grpc into custom_allocs

Makefile

build.yaml

src/core/compression/message_compress.c

src/core/surface/channel.c

test/core/compression/message_compress_test.c

test/core/surface/invalid_channel_args_test.c

test/cpp/end2end/async_end2end_test.cc

tools/jenkins/grpc_interop_php/Dockerfile

tools/jenkins/grpc_interop_php/build_interop.sh

tools/run_tests/interop_html_report.template

tools/run_tests/report_utils.py

tools/run_tests/sources_and_headers.json

tools/run_tests/tests.json

vsprojects/buildtests_c.sln

..._channel_args_test/grpc_invalid_channel_args_test.vcxproj

..._args_test/grpc_invalid_channel_args_test.vcxproj.filters