Make cc output surface creation async

cc/test/layer_tree_host_common_test.h

Index: cc/test/layer_tree_host_common_test.h
diff --git a/cc/test/layer_tree_host_common_test.h b/cc/test/layer_tree_host_common_test.h
index 67eb6cc58b3da0af29b229a57c1154352fc5c0ef..f5dc48ea3a34f6de29b5a9022a6a3edf94c5998c 100644
--- a/cc/test/layer_tree_host_common_test.h
+++ b/cc/test/layer_tree_host_common_test.h
@@ -9,6 +9,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/layer_lists.h"
+#include "cc/test/fake_layer_tree_host_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gfx {
@@ -20,6 +21,7 @@ class Transform;
 
 namespace cc {
 
+class FakeLayerTreeHost;
 class Layer;
 class LayerImpl;
 class RenderSurfaceLayerList;
@@ -116,10 +118,13 @@ class LayerTreeHostCommonTestBase {
     return render_surface_layer_list_count_;
   }
 
+  scoped_ptr<FakeLayerTreeHost> CreateFakeLayerTreeHost();
+
  private:
   scoped_ptr<RenderSurfaceLayerList> render_surface_layer_list_;
   scoped_ptr<std::vector<LayerImpl*> > render_surface_layer_list_impl_;
 
+  FakeLayerTreeHostClient client_;
   int render_surface_layer_list_count_;
 };