cc: return resources via a ReturnedResource struct rather than TransferableResource

cc/test/fake_output_surface.cc

Index: cc/test/fake_output_surface.cc
diff --git a/cc/test/fake_output_surface.cc b/cc/test/fake_output_surface.cc
index 9ae75529af8c0f4bc090942a772a51725136af99..d5ed0b3451ba9fbf32f800300d1edff3598320ba 100644
--- a/cc/test/fake_output_surface.cc
+++ b/cc/test/fake_output_surface.cc
@@ -133,7 +133,7 @@ void FakeOutputSurface::ReturnResource(unsigned id, CompositorFrameAck* ack) {
       break;
   }
   DCHECK(it != resources_held_by_parent_.end());
-  ack->resources.push_back(*it);
+  ack->resources.push_back(it->Return());
   resources_held_by_parent_.erase(it);
 }