Mark Surface as damaged when it receives a CopyOutputRequest.

cc/surfaces/surface_factory.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/surfaces/surface_factory.h"
 
 #include "cc/output/compositor_frame.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
@@ skipping 36 matching lines @@
 void SurfaceFactory::RequestCopyOfSurface(
     SurfaceId surface_id,
     scoped_ptr<CopyOutputRequest> copy_request) {
   OwningSurfaceMap::iterator it = surface_map_.find(surface_id);
   if (it == surface_map_.end()) {
     copy_request->SendEmptyResult();
     return;
   }
   DCHECK(it->second->factory() == this);
   it->second->RequestCopyOfOutput(copy_request.Pass());
+  manager_->SurfaceModified(surface_id);
 }
 
 void SurfaceFactory::ReceiveFromChild(
     const TransferableResourceArray& resources) {
   holder_.ReceiveFromChild(resources);
 }
 
 void SurfaceFactory::RefResources(const TransferableResourceArray& resources) {
   holder_.RefResources(resources);
 }
 
 void SurfaceFactory::UnrefResources(const ReturnedResourceArray& resources) {
   holder_.UnrefResources(resources);
 }
 
 }  // namespace cc