Roll Chrome into Mojo.

cc/surfaces/surface_manager.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_manager.h"
 
 #include "base/logging.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_id_allocator.h"
 
@@ skipping 60 matching lines @@
 }
 
 Surface* SurfaceManager::GetSurfaceForId(SurfaceId surface_id) {
   DCHECK(thread_checker_.CalledOnValidThread());
   SurfaceMap::iterator it = surface_map_.find(surface_id);
   if (it == surface_map_.end())
     return NULL;
   return it->second;
 }
 
-void SurfaceManager::SurfaceModified(SurfaceId surface_id) {
+bool SurfaceManager::SurfaceModified(SurfaceId surface_id) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  FOR_EACH_OBSERVER(
-      SurfaceDamageObserver, observer_list_, OnSurfaceDamaged(surface_id));
+  bool changed = false;
+  FOR_EACH_OBSERVER(SurfaceDamageObserver, observer_list_,
+                    OnSurfaceDamaged(surface_id, &changed));
+  return changed;
 }
 
 }  // namespace cc