Stop painting when receiving delegated frame

ui/aura/window.cc

Index: ui/aura/window.cc
diff --git a/ui/aura/window.cc b/ui/aura/window.cc
index 992642ed059430e692535edddb94498b63cf7eed..5682e26ad80cd7d0bc6eee598982b24650b8f80f 100644
--- a/ui/aura/window.cc
+++ b/ui/aura/window.cc
@@ -497,6 +497,13 @@ void Window::SchedulePaintInRect(const gfx::Rect& rect) {
   }
 }
 
+void Window::OnDelegatedFrameDamage(const gfx::Rect &damage_rect_in_dip) {
+  DCHECK(layer());
+  FOR_EACH_OBSERVER(WindowObserver,
+                    observers_,
+                    OnWindowPaintScheduled(this, damage_rect_in_dip));
+}
+
 void Window::StackChildAtTop(Window* child) {
   if (children_.size() <= 1 || child == children_.back())
     return;  // In the front already.