cc: Adding support for RGBA_4444 tile textures

cc/resources/tile_manager.h

Index: cc/resources/tile_manager.h
diff --git a/cc/resources/tile_manager.h b/cc/resources/tile_manager.h
index 1e5d7ff1cd5dbce91bfaceabc961b4a1500bcb66..189d1c55378d9d576d1927c9302951ca3a8bc7a7 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -87,7 +87,8 @@ class CC_EXPORT TileManager : public RasterWorkerPoolClient {
       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_;
@@ -177,6 +178,7 @@ class CC_EXPORT TileManager : public RasterWorkerPoolClient {
   LayerPixelRefTaskMap image_decode_tasks_;
 
   RasterTaskCompletionStats update_visible_tiles_stats_;
+  bool use_16_bit_tiles_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };