cc: Adding support for RGBA_4444 tile textures

cc/trees/layer_tree_settings.h

 // Copyright 2011 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.
 
 #ifndef CC_TREES_LAYER_TREE_SETTINGS_H_
 #define CC_TREES_LAYER_TREE_SETTINGS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 52 matching lines @@
   bool use_pinch_zoom_scrollbars;
   bool use_pinch_virtual_viewport;
   size_t max_tiles_for_interest_area;
   size_t max_unused_resource_memory_percentage;
   int highp_threshold_min;
   bool force_direct_layer_drawing;  // With Skia GPU backend.
   bool strict_layer_property_change_checking;
   bool use_map_image;
   std::string compositor_name;
   bool ignore_root_layer_flings;
+  bool use_rgba_4444_textures;
 
   LayerTreeDebugState initial_debug_state;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_SETTINGS_H_