Avoid Copying damage rect when using Overlays

cc/output/overlay_strategy_single_on_top.h

Index: cc/output/overlay_strategy_single_on_top.h
diff --git a/cc/output/overlay_strategy_single_on_top.h b/cc/output/overlay_strategy_single_on_top.h
index bdf2cc2f59b522d2bf0f13c24eaf84663f90b77c..29d98de7ca79f38ccf8c92a37e5e9153daf18c1e 100644
--- a/cc/output/overlay_strategy_single_on_top.h
+++ b/cc/output/overlay_strategy_single_on_top.h
@@ -19,13 +19,15 @@ class CC_EXPORT OverlayStrategySingleOnTop : public OverlayProcessor::Strategy {
 
   bool Attempt(ResourceProvider* resource_provider,
                RenderPassList* render_passes,
-               OverlayCandidateList* candidate_list) override;
+               OverlayCandidateList* candidate_list,
+               gfx::Rect* damage_rect) override;
 
  private:
   bool TryOverlay(QuadList* quad_list,
                   OverlayCandidateList* candidate_list,
                   const OverlayCandidate& candidate,
-                  QuadList::Iterator candidate_iterator);
+                  QuadList::Iterator candidate_iterator,
+                  gfx::Rect* damage_rect);
 
   OverlayCandidateValidator* capability_checker_;  // Weak.