cc: add PaintTimeCounter to keep track of per frame paint time

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': [
       'animation.cc',
       'animation.h',
       'animation_curve.cc',
@@ skipping 120 matching lines @@
       'nine_patch_layer_impl.cc',
       'nine_patch_layer_impl.h',
       'occlusion_tracker.cc',
       'occlusion_tracker.h',
       'output_surface.h',
       'output_surface_client.h',
       'overdraw_metrics.cc',
       'overdraw_metrics.h',
       'page_scale_animation.cc',
       'page_scale_animation.h',
+      'paint_time_counter.cc',
+      'paint_time_counter.h',
       'picture.cc',
       'picture.h',
       'picture_image_layer.cc',
       'picture_image_layer.h',
       'picture_layer.cc',
       'picture_layer.h',
       'picture_layer_impl.cc',
       'picture_layer_impl.h',
       'picture_layer_tiling.cc',
       'picture_layer_tiling.h',
@@ skipping 179 matching lines @@
       ],
       'all_dependent_settings': {
         'include_dirs': [
           # TODO(jamesr): Remove once https://webkit.org/b/105259 lands + rolls
           '<(webkit_src_dir)/Source/Platform/chromium'
         ]
       }
     },
   ],
 }