Allows observers to be notified when layer animations complete.

ui/gfx/compositor/layer_animator_delegate.h

-// Copyright (c) 2011 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 UI_GFX_COMPOSITOR_LAYER_ANIMATOR_DELEGATE_H_
-#define UI_GFX_COMPOSITOR_LAYER_ANIMATOR_DELEGATE_H_
-#pragma once
-
-#include "ui/gfx/rect.h"
-#include "ui/gfx/transform.h"
-#include "ui/gfx/compositor/compositor_export.h"
-#include "ui/gfx/compositor/layer_animation_delegate.h"
-
-namespace ui {
-
-class LayerAnimationSequence;
-
-// Layer animators interact with the layers using this interface.
-class COMPOSITOR_EXPORT LayerAnimatorDelegate : public LayerAnimationDelegate {
- public:
-  // Called when the |sequence| ends. Not called if |sequence| is aborted.
-  virtual void OnLayerAnimationEnded(LayerAnimationSequence* sequence) = 0;
-
-  // if this becomes necessary, this would be the appropriate place to add
-  // notifications about elements starting or ending, or sequences starting.
-
- protected:
-  virtual ~LayerAnimatorDelegate() {}
-};
-
-}  // namespace ui
-
-#endif  // UI_GFX_COMPOSITOR_LAYER_ANIMATOR_DELEGATE_H_