Re-land: cc: Use worker context for one-copy tile initialization.

cc/test/layer_tree_pixel_resource_test.h

Index: cc/test/layer_tree_pixel_resource_test.h
diff --git a/cc/test/layer_tree_pixel_resource_test.h b/cc/test/layer_tree_pixel_resource_test.h
index 16b7ca9c7ddec48af2c86dc7dc7893e0123b2e3e..8c3242af9f53d22e8e794a21b1fe498b124e5886 100644
--- a/cc/test/layer_tree_pixel_resource_test.h
+++ b/cc/test/layer_tree_pixel_resource_test.h
@@ -38,8 +38,7 @@ class LayerTreeHostPixelResourceTest : public LayerTreePixelTest {
   void CreateResourceAndTileTaskWorkerPool(
       LayerTreeHostImpl* host_impl,
       scoped_ptr<TileTaskWorkerPool>* tile_task_worker_pool,
-      scoped_ptr<ResourcePool>* resource_pool,
-      scoped_ptr<ResourcePool>* staging_resource_pool) override;
+      scoped_ptr<ResourcePool>* resource_pool) override;
 
   void RunPixelResourceTest(scoped_refptr<Layer> content_root,
                             base::FilePath file_name);
@@ -53,7 +52,6 @@ class LayerTreeHostPixelResourceTest : public LayerTreePixelTest {
   };
 
  protected:
-  unsigned staging_texture_target_;
   unsigned draw_texture_target_;
   TileTaskWorkerPoolOption resource_pool_option_;
   bool initialized_;