[ash] Cleanup of ScopedOverviewAnimationSettings

ash/wm/overview/scoped_overview_animation_settings.h

 // Copyright 2016 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 ASH_WM_OVERVIEW_SCOPED_OVERVIEW_ANIMATION_SETTINGS_H_
 #define ASH_WM_OVERVIEW_SCOPED_OVERVIEW_ANIMATION_SETTINGS_H_
 
+#include <memory>
+
+#include "ash/wm/overview/overview_animation_type.h"
+#include "base/macros.h"
+
+namespace aura {
+class Window;
+}  // namespace aura
+
 namespace ui {
 class ImplicitAnimationObserver;
+class ScopedLayerAnimationSettings;
 }  // namespace ui
 
 namespace ash {
 
 // ScopedOverviewAnimationSettings correctly configures the animation
-// settings for a WmWindow given an OverviewAnimationType.
+// settings for an aura::Window given an OverviewAnimationType.
 class ScopedOverviewAnimationSettings {
  public:
-  virtual ~ScopedOverviewAnimationSettings() {}
-  virtual void AddObserver(ui::ImplicitAnimationObserver* observer) = 0;
+  ScopedOverviewAnimationSettings(OverviewAnimationType animation_type,
+                                  aura::Window* window);
+  ~ScopedOverviewAnimationSettings();
+  void AddObserver(ui::ImplicitAnimationObserver* observer);
+
+ private:
+  // The managed animation settings.
+  std::unique_ptr<ui::ScopedLayerAnimationSettings> animation_settings_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedOverviewAnimationSettings);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_SCOPED_OVERVIEW_ANIMATION_SETTINGS_H_