Add latency measurement system

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': {
     'cc_source_files': [
       'active_animation.cc',
       'active_animation.h',
       'animation_curve.cc',
@@ skipping 72 matching lines @@
       'image_layer.h',
       'input_handler.h',
       'io_surface_draw_quad.cc',
       'io_surface_draw_quad.h',
       'io_surface_layer.cc',
       'io_surface_layer.h',
       'io_surface_layer_impl.cc',
       'io_surface_layer_impl.h',
       'keyframed_animation_curve.cc',
       'keyframed_animation_curve.h',
+      'latency_info.h',
       'layer.cc',
       'layer.h',
       'layer_animation_controller.cc',
       'layer_animation_controller.h',
       'layer_animation_event_observer.h',
       'layer_animation_value_observer.h',
       'layer_impl.cc',
       'layer_impl.h',
       'layer_iterator.cc',
       'layer_iterator.h',
@@ skipping 220 matching lines @@
       ],
       'all_dependent_settings': {
         'include_dirs': [
           # TODO(jamesr): Remove once https://webkit.org/b/105259 lands + rolls
           '<(webkit_src_dir)/Source/Platform/chromium'
         ]
       }
     },
   ],
 }