Merge pull request #2633 from ctiller/virtuous-velvit-velociraptor

src/core/channel/client_channel.c

src/core/iomgr/iomgr.c

src/core/iomgr/tcp_posix.c

src/core/transport/chttp2/internal.h

src/core/transport/chttp2/parsing.c

src/core/transport/chttp2/stream_lists.c

src/core/transport/chttp2/writing.c

src/core/transport/chttp2_transport.c

src/core/transport/transport_op_string.c

test/cpp/end2end/end2end_test.cc

test/cpp/util/messages.proto