Update from chromium https://crrev.com/301315

gpu/command_buffer_service.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'include_dirs': [
     '..',
   ],
   'all_dependent_settings': {
     'include_dirs': [
@@ skipping 75 matching lines @@
     'command_buffer/service/gpu_tracer.cc',
     'command_buffer/service/gpu_tracer.h',
     'command_buffer/service/id_manager.h',
     'command_buffer/service/id_manager.cc',
     'command_buffer/service/image_manager.cc',
     'command_buffer/service/image_manager.h',
     'command_buffer/service/in_process_command_buffer.cc',
     'command_buffer/service/in_process_command_buffer.h',
     'command_buffer/service/logger.cc',
     'command_buffer/service/logger.h',
-    'command_buffer/service/mailbox_manager.cc',
     'command_buffer/service/mailbox_manager.h',
-    'command_buffer/service/mailbox_synchronizer.cc',
-    'command_buffer/service/mailbox_synchronizer.h',
+    'command_buffer/service/mailbox_manager_impl.cc',
+    'command_buffer/service/mailbox_manager_impl.h',
+    'command_buffer/service/mailbox_manager_sync.cc',
+    'command_buffer/service/mailbox_manager_sync.h',
     'command_buffer/service/memory_program_cache.h',
     'command_buffer/service/memory_program_cache.cc',
     'command_buffer/service/mocks.h',
     'command_buffer/service/program_manager.h',
     'command_buffer/service/program_manager.cc',
     'command_buffer/service/query_manager.h',
     'command_buffer/service/query_manager.cc',
     'command_buffer/service/renderbuffer_manager.h',
     'command_buffer/service/renderbuffer_manager.cc',
     'command_buffer/service/program_cache.h',
@@ skipping 24 matching lines @@
       ],
     }],
     ['OS in ("win", "android") or (OS == "linux" and use_x11 == 1)', {
       'sources': [
         'command_buffer/service/async_pixel_transfer_manager_egl.cc',
         'command_buffer/service/async_pixel_transfer_manager_egl.h',
       ],
     }],
   ],
 }