Merge remote-tracking branch 'upstream/master'

.travis.yml

gRPC.podspec

src/compiler/cpp_generator.cc

src/core/iomgr/endpoint_pair_windows.c

src/core/iomgr/iocp_windows.c

src/core/iomgr/iomgr_windows.c

src/core/iomgr/pollset_kick_windows.h

src/core/iomgr/pollset_windows.c

src/core/iomgr/pollset_windows.h

src/core/iomgr/socket_windows.c

src/core/iomgr/socket_windows.h

src/core/iomgr/tcp_client_windows.c

src/core/iomgr/tcp_posix.c

src/core/iomgr/tcp_server_windows.c

src/core/iomgr/tcp_windows.c

src/core/profiling/basic_timers.c

src/core/profiling/timers.h

src/core/profiling/timers_preciseclock.h

src/core/surface/call.c

src/core/surface/init.c