cc: Add some impl-side painting stub classes and APIs

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 93 matching lines @@
       'nine_patch_layer.cc',
       'nine_patch_layer.h',
       'nine_patch_layer_impl.cc',
       'nine_patch_layer_impl.h',
       'occlusion_tracker.cc',
       'occlusion_tracker.h',
       '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_pile.cc',
+      'picture_pile.h',
       'platform_color.h',
       'prioritized_texture.cc',
       'prioritized_texture.h',
       'prioritized_texture_manager.cc',
       'prioritized_texture_manager.h',
       'priority_calculator.cc',
       'priority_calculator.h',
       'program_binding.cc',
       'program_binding.h',
       'proxy.cc',
@@ skipping 139 matching lines @@
       ],
       'sources': [
         '<@(cc_source_files)',
         'stubs/Region.h',
 
         'stubs/config.h',
       ],
     },
   ],
 }