Roll Chrome into Mojo.

cc/surfaces/surface_manager.cc

Index: cc/surfaces/surface_manager.cc
diff --git a/cc/surfaces/surface_manager.cc b/cc/surfaces/surface_manager.cc
index 050f04b062a991d2dfef675e7ce73dc78b587bd7..117d82ab659394458f678ac13da90eaa15b9d00b 100644
--- a/cc/surfaces/surface_manager.cc
+++ b/cc/surfaces/surface_manager.cc
@@ -78,10 +78,12 @@ Surface* SurfaceManager::GetSurfaceForId(SurfaceId surface_id) {
   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