gpu: Extract the gpu timing code from gpu_tracer.

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 69 matching lines @@
     'command_buffer/service/gl_utils.h',
     'command_buffer/service/gpu_scheduler.cc',
     'command_buffer/service/gpu_scheduler.h',
     'command_buffer/service/gpu_scheduler_mock.h',
     'command_buffer/service/gpu_state_tracer.cc',
     'command_buffer/service/gpu_state_tracer.h',
     'command_buffer/service/gpu_switches.cc',
     'command_buffer/service/gpu_switches.h',
     'command_buffer/service/gpu_tracer.cc',
     'command_buffer/service/gpu_tracer.h',
+    'command_buffer/service/gpu_timing.cc',
+    'command_buffer/service/gpu_timing.h',
     'command_buffer/service/id_manager.h',
     'command_buffer/service/id_manager.cc',
     'command_buffer/service/image_factory.cc',
     'command_buffer/service/image_factory.h',
     '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',
@@ skipping 43 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',
       ],
     }],
   ],
 }