cc: Introduce mechanism to observe CompositorFrames submitted to new surfaceIDs

cc/surfaces/surface_damage_observer.h

Index: cc/surfaces/surface_damage_observer.h
diff --git a/cc/surfaces/surface_damage_observer.h b/cc/surfaces/surface_damage_observer.h
deleted file mode 100644
index b266e6e508edbe0c4320e4aba9b247c095adf2cd..0000000000000000000000000000000000000000
--- a/cc/surfaces/surface_damage_observer.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// 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_
-
-namespace cc {
-
-class SurfaceId;
-
-class SurfaceDamageObserver {
- public:
-  // Runs when a Surface is damaged. *changed should be set to true if this
-  // causes a Display to be damaged.
-  virtual void OnSurfaceDamaged(const SurfaceId& surface_id, bool* changed) = 0;
-};
-
-}  // namespace cc
-
-#endif  // CC_SURFACES_SURFACE_DAMAGE_OBSERVER_H_