Add OnDisplayMetricsChanged in DisplayObserver.

ash/display/resolution_notification_controller.h

 // Copyright 2013 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_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_
 #define ASH_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/display/display_controller.h"
 #include "base/callback.h"
@@ skipping 61 matching lines @@
   // Create a new notification, or update its content if it already exists.
   // |enable_spoken_feedback| is set to false when the notification is updated
   // during the countdown so the update isn't necessarily read by the spoken
   // feedback.
   void CreateOrUpdateNotification(bool enable_spoken_feedback);
 
   // Called every second for timeout.
   void OnTimerTick();
 
   // gfx::DisplayObserver overrides:
-  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
   virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
   virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
+  virtual void OnDisplayMetricsChanged(const gfx::Display& display,
+      DisplayObserver::MetricsType) OVERRIDE;
 
   // DisplayController::Observer overrides:
   virtual void OnDisplayConfigurationChanged() OVERRIDE;
 
   static void SuppressTimerForTest();
 
   scoped_ptr<ResolutionChangeInfo> change_info_;
 
   DISALLOW_COPY_AND_ASSIGN(ResolutionNotificationController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_