It is time.

ui/compositor/closure_animation_observer.h

-// Copyright 2014 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_COMPOSITOR_CLOSURE_ANIMATION_OBSERVER_H_
-#define UI_COMPOSITOR_CLOSURE_ANIMATION_OBSERVER_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "ui/compositor/compositor_export.h"
-#include "ui/compositor/layer_animation_observer.h"
-
-namespace ui {
-
-// Runs a callback at the end of the animation. This observe also destroys
-// itself afterwards.
-class COMPOSITOR_EXPORT ClosureAnimationObserver
-    : public ImplicitAnimationObserver {
- public:
-  explicit ClosureAnimationObserver(const base::Closure& closure);
-
- private:
-  ~ClosureAnimationObserver() override;
-
-  // ImplicitAnimationObserver:
-  void OnImplicitAnimationsCompleted() override;
-
-  const base::Closure closure_;
-
-  DISALLOW_COPY_AND_ASSIGN(ClosureAnimationObserver);
-};
-
-}  // namespace ui
-
-#endif  // UI_COMPOSITOR_CLOSURE_ANIMATION_OBSERVER_H_