It is time.

ui/aura/client/event_client.h

-// Copyright (c) 2012 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_CLIENT_EVENT_CLIENT_H_
-#define UI_AURA_CLIENT_EVENT_CLIENT_H_
-
-#include "ui/aura/aura_export.h"
-
-namespace ui {
-class EventTarget;
-}
-
-namespace aura {
-class Window;
-namespace client {
-
-// An interface implemented by an object that alters event processing.
-class AURA_EXPORT EventClient {
- public:
-  // Returns true if events can be processed by |window| or any of its children.
-  virtual bool CanProcessEventsWithinSubtree(const Window* window) const = 0;
-
-  // Returns the top level EventTarget for the current environment.
-  virtual ui::EventTarget* GetToplevelEventTarget() = 0;
-
- protected:
-  virtual ~EventClient() {}
-};
-
-// Sets/Gets the event client on the root Window.
-AURA_EXPORT void SetEventClient(Window* root_window, EventClient* client);
-AURA_EXPORT EventClient* GetEventClient(const Window* root_window);
-
-}  // namespace clients
-}  // namespace aura
-
-#endif  // UI_AURA_CLIENT_EVENT_CLIENT_H_