Refactored GLContext to own GPUTiming which spawn GPUTimingClients.

ui/gl/gl.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
 
   'targets': [
@@ skipping 95 matching lines @@
         'gl_surface_stub.h',
         'gl_surface_win.cc',
         'gl_surface_x11.cc',
         'gl_switches.cc',
         'gl_switches.h',
         'gl_version_info.cc',
         'gl_version_info.h',
         'gpu_switching_manager.cc',
         'gpu_switching_manager.h',
         'gpu_switching_observer.h',
+        'gpu_timing.cc',
+        'gpu_timing.h',
         'scoped_binders.cc',
         'scoped_binders.h',
         'scoped_make_current.cc',
         'scoped_make_current.h',
         'sync_control_vsync_provider.cc',
         'sync_control_vsync_provider.h',
       ],
       'conditions': [
         ['OS in ("win", "android", "linux")', {
           'sources': [
@@ skipping 184 matching lines @@
           ],
           'variables': {
             'jni_gen_package': 'ui/gl',
           },
           'includes': [ '../../build/jni_generator.gypi' ],
         },
       ],
     }],
   ],
 }