AddedToRootWindowObserver  600 ui/aura/window_unittest.cc   DISALLOW_COPY_AND_ASSIGN(AddedToRootWindowObserver);
AddedToRootWindowObserver  604 ui/aura/window_unittest.cc   AddedToRootWindowObserver parent_observer;
AddedToRootWindowObserver  605 ui/aura/window_unittest.cc   AddedToRootWindowObserver child_observer;