chromeos: changes how DisplayManagerObservers are notified

ash/mus/window_manager.h

 // Copyright 2015 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_WINDOW_MANAGER_H_
 #define ASH_MUS_WINDOW_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 120 matching lines @@
 
   // Called once the first Display has been obtained.
   void CreateShell(
       std::unique_ptr<aura::WindowTreeHostMus> primary_window_tree_host);
 
   void CreateAndRegisterRootWindowController(
       std::unique_ptr<aura::WindowTreeHostMus> window_tree_host,
       const display::Display& display,
       ash::RootWindowController::RootWindowType root_window_type);
 
+  // Sets the frame decoration values on the server.
+  void InstallFrameDecorationValues();
+
   // Deletes the specified RootWindowController. Called when a display is
   // removed. |in_shutdown| is true if called from Shutdown().
   void DestroyRootWindowController(RootWindowController* root_window_controller,
                                    bool in_shutdown);
 
   void Shutdown();
 
   // WindowTreeClientDelegate:
   void OnEmbed(
       std::unique_ptr<aura::WindowTreeHostMus> window_tree_host) override;
@@ skipping 89 matching lines @@
 
   std::unique_ptr<ui::InputDeviceClient> input_device_client_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManager);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_WINDOW_MANAGER_H_