cc: Adding BeginFrameTracker object and removing Now() from LTHI.

cc/cc.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 482 matching lines @@
         'resources/transferable_resource.h',
         'resources/ui_resource_bitmap.cc',
         'resources/ui_resource_bitmap.h',
         'resources/ui_resource_client.h',
         'resources/ui_resource_request.cc',
         'resources/ui_resource_request.h',
         'resources/video_resource_updater.cc',
         'resources/video_resource_updater.h',
         'scheduler/begin_frame_source.cc',
         'scheduler/begin_frame_source.h',
+        'scheduler/begin_frame_tracker.cc',
+        'scheduler/begin_frame_tracker.h',
         'scheduler/commit_earlyout_reason.h',
         'scheduler/delay_based_time_source.cc',
         'scheduler/delay_based_time_source.h',
         'scheduler/draw_result.h',
         'scheduler/scheduler.cc',
         'scheduler/scheduler.h',
         'scheduler/scheduler_settings.cc',
         'scheduler/scheduler_settings.h',
         'scheduler/scheduler_state_machine.cc',
         'scheduler/scheduler_state_machine.h',
@@ skipping 154 matching lines @@
             'raster/texture_compressor_etc1_sse.h',
           ],
           'cflags': [
             '-msse2',
           ],
         }],
       ],
     },    
   ],
 }