Avoid Copying damage rect when using Overlays

cc/output/overlay_strategy_single_on_top.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_OUTPUT_OVERLAY_STRATEGY_SINGLE_ON_TOP_H_
 #define CC_OUTPUT_OVERLAY_STRATEGY_SINGLE_ON_TOP_H_
 
 #include "cc/output/overlay_processor.h"
 
 namespace cc {
 
 class OverlayCandidateValidator;
 
 class CC_EXPORT OverlayStrategySingleOnTop : public OverlayProcessor::Strategy {
  public:
   explicit OverlayStrategySingleOnTop(
       OverlayCandidateValidator* capability_checker);
   ~OverlayStrategySingleOnTop() override;
 
   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.
 
   DISALLOW_COPY_AND_ASSIGN(OverlayStrategySingleOnTop);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_STRATEGY_SINGLE_ON_TOP_H_