It is time.

ui/aura/client/focus_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_FOCUS_CLIENT_H_
-#define UI_AURA_CLIENT_FOCUS_CLIENT_H_
-
-#include "ui/aura/aura_export.h"
-
-namespace ui {
-class Event;
-}
-
-namespace aura {
-class Window;
-namespace client {
-class FocusChangeObserver;
-
-// An interface implemented by an object that manages window focus.
-class AURA_EXPORT FocusClient {
- public:
-  virtual ~FocusClient() {}
-
-  virtual void AddObserver(FocusChangeObserver* observer) = 0;
-  virtual void RemoveObserver(FocusChangeObserver* observer) = 0;
-
-  // Focuses |window|. Passing NULL clears focus.
-  virtual void FocusWindow(Window* window) = 0;
-
-  // Sets focus to |window| if it's within the active window. Not intended as a
-  // general purpose API, use FocusWindow() instead.
-  virtual void ResetFocusWithinActiveWindow(Window* window) = 0;
-
-  // Retrieves the focused window, or NULL if there is none.
-  virtual Window* GetFocusedWindow() = 0;
-};
-
-// Sets/Gets the focus client on the root Window.
-AURA_EXPORT void SetFocusClient(Window* root_window, FocusClient* client);
-AURA_EXPORT FocusClient* GetFocusClient(Window* window);
-AURA_EXPORT FocusClient* GetFocusClient(const Window* window);
-
-}  // namespace clients
-}  // namespace aura
-
-#endif  // UI_AURA_CLIENT_FOCUS_CLIENT_H_