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

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index 68d8c9af04cf6592984b342940c01337ed0826b4..3437714b6427061a98adcb5c0a8ecbd0454d6d78 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -36,8 +36,7 @@ class TestHooks : public AnimationDelegate {
   virtual void CreateResourceAndTileTaskWorkerPool(
       LayerTreeHostImpl* host_impl,
       scoped_ptr<TileTaskWorkerPool>* tile_task_worker_pool,
-      scoped_ptr<ResourcePool>* resource_pool,
-      scoped_ptr<ResourcePool>* staging_resource_pool);
+      scoped_ptr<ResourcePool>* resource_pool);
   virtual void WillBeginImplFrameOnThread(LayerTreeHostImpl* host_impl,
                                           const BeginFrameArgs& args) {}
   virtual void DidFinishImplFrameOnThread(LayerTreeHostImpl* host_impl) {}