Pass accurate contentsScale to LayerImpl.

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': [
       'hash_pair.h',
       'scoped_ptr_deque.h',
       'scoped_ptr_hash_map.h',
       'scoped_ptr_vector.h',
       'bitmap_content_layer_updater.cc',
       'bitmap_content_layer_updater.h',
       'bitmap_skpicture_content_layer_updater.cc',
       'bitmap_skpicture_content_layer_updater.h',
       'caching_bitmap_content_layer_updater.cc',
       'caching_bitmap_content_layer_updater.h',
       'active_animation.cc',
       'active_animation.h',
       'append_quads_data.h',
       'animation_curve.cc',
       'animation_curve.h',
       'animation_events.h',
       'checkerboard_draw_quad.cc',
       'checkerboard_draw_quad.h',
       'completion_event.h',
+      'contents_scaling_layer.cc',
+      'contents_scaling_layer.h',
       'damage_tracker.cc',
       'damage_tracker.h',
       'debug_border_draw_quad.cc',
       'debug_border_draw_quad.h',
       'debug_rect_history.cc',
       'debug_rect_history.h',
       'delay_based_time_source.cc',
       'delay_based_time_source.h',
       'delegated_renderer_layer_impl.cc',
       'delegated_renderer_layer_impl.h',
@@ skipping 239 matching lines @@
         'stubs/int_rect.h',
         'stubs/int_size.h',
         'stubs/not_implemented.h',
         'stubs/skia_utils.h',
         'stubs/tiling_data.h',
         'stubs/unit_bezier.h',
       ],
     },
   ],
 }