[ash] Cleanup of ScopedOverviewAnimationSettings

ash/wm/overview/scoped_overview_animation_settings.h

Index: ash/wm/overview/scoped_overview_animation_settings.h
diff --git a/ash/wm/overview/scoped_overview_animation_settings.h b/ash/wm/overview/scoped_overview_animation_settings.h
index a8898bfb45190bb587673c19781fc0d1ab9af912..4734cf8f8a6f86b443cd68f93c4b8d8956b0c696 100644
--- a/ash/wm/overview/scoped_overview_animation_settings.h
+++ b/ash/wm/overview/scoped_overview_animation_settings.h
@@ -5,18 +5,36 @@
 #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