Avoid Copying damage rect when using Overlays

cc/output/overlay_strategy_sandwich.h

 // Copyright 2015 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_SANDWICH_H_
 #define CC_OUTPUT_OVERLAY_STRATEGY_SANDWICH_H_
 
 #include "cc/output/overlay_processor.h"
 
 namespace cc {
 
 class OverlayCandidateValidator;
 
 // The sandwich strategy looks for a video quad without regard to quads above
 // it. The video is "overlaid" on top of the scene, and then the non-empty
 // parts of the scene are "overlaid" on top of the video. This is only valid
 // for overlay contents that are fully opaque.
 class CC_EXPORT OverlayStrategySandwich : public OverlayProcessor::Strategy {
  public:
   explicit OverlayStrategySandwich(
       OverlayCandidateValidator* capability_checker);
   ~OverlayStrategySandwich() override;
 
   bool Attempt(ResourceProvider* resource_provider,
                RenderPassList* render_passes,
-               OverlayCandidateList* candidate_list) override;
+               OverlayCandidateList* candidate_list,
+               gfx::Rect* damage_rect) override;
 
  private:
   QuadList::Iterator TryOverlay(RenderPass* render_pass,
                                 OverlayCandidateList* candidate_list,
                                 const OverlayCandidate& candidate,
                                 QuadList::Iterator candidate_iterator);
 
   OverlayCandidateValidator* capability_checker_;  // Weak.
 
   DISALLOW_COPY_AND_ASSIGN(OverlayStrategySandwich);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_STRATEGY_SANDWICH_H_