cc: Add PictureLayerTiling for impl-side painting

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 99 matching lines @@
       'overdraw_metrics.cc',
       'overdraw_metrics.h',
       'page_scale_animation.cc',
       'page_scale_animation.h',
       'picture.cc',
       'picture.h',
       'picture_layer.cc',
       'picture_layer.h',
       'picture_layer_impl.cc',
       'picture_layer_impl.h',
+      'picture_layer_tiling.cc',
+      'picture_layer_tiling.h',
       'picture_pile.cc',
       'picture_pile.h',
       'platform_color.h',
       'prioritized_resource.cc',
       'prioritized_resource.h',
       'prioritized_resource_manager.cc',
       'prioritized_resource_manager.h',
       'priority_calculator.cc',
       'priority_calculator.h',
       'program_binding.cc',
@@ skipping 141 matching lines @@
       'include_dirs': [
         '<(webkit_src_dir)/Source/Platform/chromium',
         '<@(cc_stubs_dirs)',
       ],
       'sources': [
         '<@(cc_source_files)',
       ],
     },
   ],
 }