Stop painting when receiving delegated frame

ui/compositor/layer_delegate.h

Index: ui/compositor/layer_delegate.h
diff --git a/ui/compositor/layer_delegate.h b/ui/compositor/layer_delegate.h
index 12b137f0cf2a16ebba5b3962ceee478e9c827b7f..9312e02af91308e02768b028c61ab2811592b1d0 100644
--- a/ui/compositor/layer_delegate.h
+++ b/ui/compositor/layer_delegate.h
@@ -10,6 +10,7 @@
 
 namespace gfx {
 class Canvas;
+class Rect;
 }
 
 namespace ui {
@@ -21,6 +22,10 @@ class COMPOSITOR_EXPORT LayerDelegate {
   // clipped to the Layer's invalid rect.
   virtual void OnPaintLayer(gfx::Canvas* canvas) = 0;
 
+  // A notification that this layer has had a delegated frame swap and
+  // will be repainted.
+  virtual void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) = 0;
+
   // Called when the layer's device scale factor has changed.
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) = 0;