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 1ac2689f9bdbbe52bc6516ef924847e478bc5618..48122a8fe605fd0c5330ccf88c34c3d336ea0389 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -53,7 +53,8 @@ class CC_EXPORT TileManager : public RasterWorkerPoolClient {
       size_t num_raster_threads,
       RenderingStatsInstrumentation* rendering_stats_instrumentation,
       bool use_map_image,
-      size_t max_transfer_buffer_usage_bytes);
+      size_t max_transfer_buffer_usage_bytes,
+      bool use_rgba_4444_tiles);
   virtual ~TileManager();
 
   const GlobalStateThatImpactsTilePriority& GlobalState() const {
@@ -88,7 +89,8 @@ 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(),
+                                     ResourceProvider::RGBA_8888));
 
       bytes_releasable_ += tiles[i]->bytes_consumed_if_allocated();
       ++resources_releasable_;
@@ -103,7 +105,8 @@ class CC_EXPORT TileManager : public RasterWorkerPoolClient {
               ResourceProvider* resource_provider,
               scoped_ptr<RasterWorkerPool> raster_worker_pool,
               size_t num_raster_threads,
-              RenderingStatsInstrumentation* rendering_stats_instrumentation);
+              RenderingStatsInstrumentation* rendering_stats_instrumentation,
+              ResourceProvider::TextureType texture_type);
 
   // Methods called by Tile
   friend class Tile;
@@ -183,6 +186,7 @@ class CC_EXPORT TileManager : public RasterWorkerPoolClient {
   LayerCountMap used_layer_counts_;
 
   RasterTaskCompletionStats update_visible_tiles_stats_;
+  ResourceProvider::TextureType texture_type_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };