Handle modified displays in mustash.

ash/mus/root_window_controller.h

 // Copyright 2016 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_MUS_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_MUS_ROOT_WINDOW_CONTROLLER_H_
 
 #include <memory>
 
 #include "ash/mus/disconnected_app_handler.h"
@@ skipping 40 matching lines @@
   WmRootWindowControllerMus* wm_root_window_controller() {
     return wm_root_window_controller_.get();
   }
 
   ui::Window* NewTopLevelWindow(
       std::map<std::string, std::vector<uint8_t>>* properties);
 
   WmWindowMus* GetWindowByShellWindowId(int id);
 
   void SetWorkAreaInests(const gfx::Insets& insets);
+  void SetDisplay(const display::Display& display);
 
   WindowManager* window_manager() { return window_manager_; }
 
   const display::Display& display() const { return display_; }
 
   WmShelfMus* wm_shelf() { return wm_shelf_.get(); }
 
  private:
   friend class WmTestBase;
   friend class WmTestHelper;
@@ skipping 17 matching lines @@
 
   std::unique_ptr<DisconnectedAppHandler> disconnected_app_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowController);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_ROOT_WINDOW_CONTROLLER_H_