Reland r107720 - Enable the new layer animation framework.

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/compositor/compositor_export.h"
-
-namespace gfx {
-class Rect;
-}
-
-namespace ui {
-
-class Transform;
-
-// LayerAnimator modifies the Layer using this interface.
-class COMPOSITOR_EXPORT LayerAnimatorDelegate {
- public:
-  virtual void SetBoundsFromAnimator(const gfx::Rect& bounds) = 0;
-  virtual void SetTransformFromAnimator(const Transform& transform) = 0;
-  virtual void SetOpacityFromAnimator(float opacity) = 0;
-
- protected:
-  virtual ~LayerAnimatorDelegate() {}
-};
-
-}  // namespace ui
-
-#endif  // UI_GFX_COMPOSITOR_LAYER_H_