It is time.

ui/aura/scoped_window_targeter.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_AURA_SCOPED_WINDOW_TARGETER_H_
-#define UI_AURA_SCOPED_WINDOW_TARGETER_H_
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/aura/window_observer.h"
-
-namespace ui {
-class EventTargeter;
-}
-
-namespace aura {
-
-class Window;
-
-// ScopedWindowTargeter is used to temporarily replace the event-targeter for a
-// window. Upon construction, it installs a new targeter on the window, and upon
-// destruction, it restores the previous event-targeter on the window.
-class AURA_EXPORT ScopedWindowTargeter : public WindowObserver {
- public:
-  ScopedWindowTargeter(Window* window,
-                       scoped_ptr<ui::EventTargeter> new_targeter);
-
-  virtual ~ScopedWindowTargeter();
-
-  ui::EventTargeter* old_targeter() {
-    return old_targeter_.get();
-  }
-
- private:
-  // WindowObserver:
-  virtual void OnWindowDestroyed(Window* window) override;
-
-  Window* window_;
-  scoped_ptr<ui::EventTargeter> old_targeter_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedWindowTargeter);
-};
-
-}  // namespace aura
-
-#endif  // UI_AURA_SCOPED_WINDOW_TARGETER_H_