It is time.

ui/wm/core/shadow_controller.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_WM_CORE_SHADOW_CONTROLLER_H_
-#define UI_WM_CORE_SHADOW_CONTROLLER_H_
-
-#include <map>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/memory/ref_counted.h"
-#include "ui/wm/public/activation_change_observer.h"
-#include "ui/wm/wm_export.h"
-
-namespace aura {
-class Window;
-namespace client {
-class ActivationClient;
-}
-}
-namespace gfx {
-class Rect;
-}
-
-namespace wm {
-
-class Shadow;
-
-// ShadowController observes changes to windows and creates and updates drop
-// shadows as needed. ShadowController itself is light weight and per
-// ActivationClient. ShadowController delegates to its implementation class,
-// which observes all window creation.
-class WM_EXPORT ShadowController :
-    public aura::client::ActivationChangeObserver {
- public:
-  class WM_EXPORT TestApi {
-   public:
-    explicit TestApi(ShadowController* controller) : controller_(controller) {}
-    ~TestApi() {}
-
-    Shadow* GetShadowForWindow(aura::Window* window);
-
-   private:
-    ShadowController* controller_;  // not owned
-
-    DISALLOW_COPY_AND_ASSIGN(TestApi);
-  };
-
-  explicit ShadowController(aura::client::ActivationClient* activation_client);
-  virtual ~ShadowController();
-
-  // aura::client::ActivationChangeObserver overrides:
-  virtual void OnWindowActivated(aura::Window* gained_active,
-                                 aura::Window* lost_active) override;
-
- private:
-  class Impl;
-
-  aura::client::ActivationClient* activation_client_;
-
-  scoped_refptr<Impl> impl_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShadowController);
-};
-
-}  // namespace wm
-
-#endif  // UI_WM_CORE_SHADOW_CONTROLLER_H_