chromeos: Move files in //ash/common to //ash, part 2

ash/common/wm/overview/cleanup_animation_observer.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_COMMON_WM_OVERVIEW_CLEANUP_ANIMATION_OBSERVER_H_
-#define ASH_COMMON_WM_OVERVIEW_CLEANUP_ANIMATION_OBSERVER_H_
-
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "ash/common/wm/overview/window_selector_delegate.h"
-#include "base/macros.h"
-#include "ui/compositor/layer_animation_observer.h"
-
-namespace views {
-class Widget;
-}
-
-namespace ash {
-
-// An observer which holds onto the passed widget until the animation is
-// complete.
-class ASH_EXPORT CleanupAnimationObserver
-    : public ui::ImplicitAnimationObserver,
-      public DelayedAnimationObserver {
- public:
-  explicit CleanupAnimationObserver(std::unique_ptr<views::Widget> widget);
-  ~CleanupAnimationObserver() override;
-
-  // ui::ImplicitAnimationObserver:
-  // TODO(varkha): Look into all cases when animations are not started such as
-  // zero-duration animations and ensure that the object lifetime is handled.
-  void OnImplicitAnimationsCompleted() override;
-
-  // DelayedAnimationObserver:
-  void SetOwner(WindowSelectorDelegate* owner) override;
-  void Shutdown() override;
-
- private:
-  std::unique_ptr<views::Widget> widget_;
-  WindowSelectorDelegate* owner_;
-
-  DISALLOW_COPY_AND_ASSIGN(CleanupAnimationObserver);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_OVERVIEW_CLEANUP_ANIMATION_OBSERVER_H_