Roll Chrome into Mojo.

cc/surfaces/surface_damage_observer.h

 // 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.
 
 #ifndef CC_SURFACES_SURFACE_DAMAGE_OBSERVER_H_
 #define CC_SURFACES_SURFACE_DAMAGE_OBSERVER_H_
 
 #include "cc/surfaces/surface_id.h"
 
 namespace cc {
 
 class SurfaceDamageObserver {
  public:
-  virtual void OnSurfaceDamaged(SurfaceId surface_id) = 0;
+  // Runs when a Surface is damaged. *changed should be set to true if this
+  // causes a Display to be damaged.
+  virtual void OnSurfaceDamaged(SurfaceId surface_id, bool* changed) = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_DAMAGE_OBSERVER_H_