Avoid Copying damage rect when using Overlays

cc/output/overlay_processor.cc

 // 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.
 
 #include "cc/output/overlay_processor.h"
 
 #include "cc/output/output_surface.h"
 #include "cc/output/overlay_strategy_single_on_top.h"
 #include "cc/output/overlay_strategy_underlay.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 
 OverlayProcessor::OverlayProcessor(OutputSurface* surface) : surface_(surface) {
 }
 
 void OverlayProcessor::Initialize() {
   DCHECK(surface_);
   OverlayCandidateValidator* validator =
       surface_->GetOverlayCandidateValidator();
   if (validator)
     validator->GetStrategies(&strategies_);
 }
 
 OverlayProcessor::~OverlayProcessor() {}
 
 void OverlayProcessor::ProcessForOverlays(ResourceProvider* resource_provider,
                                           RenderPassList* render_passes,
-                                          OverlayCandidateList* candidates) {
+                                          OverlayCandidateList* candidates,
+                                          gfx::Rect* damage_rect) {
   for (auto strategy : strategies_) {
-    if (strategy->Attempt(resource_provider, render_passes, candidates))
+    if (strategy->Attempt(resource_provider, render_passes, candidates,
+                          damage_rect)) {
       return;
+    }
   }
 }
 
 }  // namespace cc