Add RootWindowController

ash/wm/window_util.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 ASH_WM_WINDOW_UTIL_H_
 #define ASH_WM_WINDOW_UTIL_H_
 #pragma once
 
 #include "ash/ash_export.h"
 
 namespace aura {
+class RootWindow;
 class Window;
 }
 
 namespace ash {
+namespace internal {
+class RootWindowController;
+}
 namespace wm {
 
 // Convenience setters/getters for |aura::client::kRootWindowActiveWindow|.
 ASH_EXPORT void ActivateWindow(aura::Window* window);
 ASH_EXPORT void DeactivateWindow(aura::Window* window);
 ASH_EXPORT bool IsActiveWindow(aura::Window* window);
 ASH_EXPORT aura::Window* GetActiveWindow();
 ASH_EXPORT bool CanActivateWindow(aura::Window* window);
+ASH_EXPORT internal::RootWindowController* GetRootWindowController(
+    aura::RootWindow* root_window);
 
 // Retrieves the activatable window for |window|. If |window| is activatable,
 // this will just return it, otherwise it will climb the parent/transient parent
 // chain looking for a window that is activatable, per the ActivationController.
 // If you're looking for a function to get the activatable "top level" window,
 // this is probably what you're looking for.
 ASH_EXPORT aura::Window* GetActivatableWindow(aura::Window* window);
 
 // Returns true if |window| is normal or default.
 ASH_EXPORT bool IsWindowNormal(aura::Window* window);
@@ skipping 16 matching lines @@
 // Restores |window|, which must not be NULL.
 ASH_EXPORT void RestoreWindow(aura::Window* window);
 
 // Moves the window to the center of the monitor.
 ASH_EXPORT void CenterWindow(aura::Window* window);
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_UTIL_H_