Merge branch 'vjpai-timers' into timers

BUILD

Makefile

build.json

include/grpc/support/port_platform.h

include/grpc/support/sync.h

include/grpc/support/tls.h

include/grpc/support/tls_gcc.h

include/grpc/support/tls_msvc.h

include/grpc/support/tls_pthread.h

src/compiler/cpp_generator.cc

src/ruby/ext/grpc/rb_byte_buffer.c

src/ruby/ext/grpc/rb_byte_buffer.h

src/ruby/ext/grpc/rb_call.c

src/ruby/ext/grpc/rb_call.h

src/ruby/ext/grpc/rb_channel.c

src/ruby/ext/grpc/rb_completion_queue.c

src/ruby/ext/grpc/rb_completion_queue.h

src/ruby/ext/grpc/rb_event.c

src/ruby/ext/grpc/rb_grpc.c

src/ruby/ext/grpc/rb_grpc.h