cc: Adding support for RGBA_4444 tile textures

cc/resources/tile_manager.h

 // Copyright 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.
 
 #ifndef CC_RESOURCES_TILE_MANAGER_H_
 #define CC_RESOURCES_TILE_MANAGER_H_
 
 #include <queue>
 #include <set>
 #include <vector>
@@ skipping 69 matching lines @@
       const std::vector<Tile*>& tiles,
       ResourceProvider* resource_provider) {
     for (size_t i = 0; i < tiles.size(); ++i) {
       ManagedTileState& mts = tiles[i]->managed_state();
       ManagedTileState::TileVersion& tile_version =
           mts.tile_versions[HIGH_QUALITY_NO_LCD_RASTER_MODE];
 
       tile_version.resource_ = make_scoped_ptr(
           new ResourcePool::Resource(resource_provider,
                                      gfx::Size(1, 1),
-                                     resource_provider->best_texture_format()));
+                                     resource_provider->best_texture_format(),
+                                     use_16_bit_tiles_));
 
       bytes_releasable_ += tiles[i]->bytes_consumed_if_allocated();
       ++resources_releasable_;
     }
   }
 
  protected:
   TileManager(TileManagerClient* client,
               ResourceProvider* resource_provider,
               scoped_ptr<RasterWorkerPool> raster_worker_pool,
@@ skipping 69 matching lines @@
 
   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 
   bool did_initialize_visible_tile_;
 
   typedef base::hash_map<uint32_t, RasterWorkerPool::Task> PixelRefTaskMap;
   typedef base::hash_map<int, PixelRefTaskMap> LayerPixelRefTaskMap;
   LayerPixelRefTaskMap image_decode_tasks_;
 
   RasterTaskCompletionStats update_visible_tiles_stats_;
+  bool use_16_bit_tiles_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_