Add OnDisplayMetricsChanged in DisplayObserver.

ash/touch/touch_observer_hud.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_TOUCH_TOUCH_OBSERVER_HUD_H_
 #define ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
 
 #include "ash/ash_export.h"
 #include "ash/display/display_controller.h"
 #include "ui/events/event_handler.h"
@@ skipping 41 matching lines @@
 
   views::Widget* widget() { return widget_; }
 
   // Overriden from ui::EventHandler.
   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
 
   // Overridden from views::WidgetObserver.
   virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
 
   // Overridden from gfx::DisplayObserver.
-  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,
+                                       uint32_t metrics) OVERRIDE;
 
 #if defined(OS_CHROMEOS)
   // Overriden from ui::DisplayConfigurator::Observer.
   virtual void OnDisplayModeChanged(
       const ui::DisplayConfigurator::DisplayStateList& outputs) OVERRIDE;
 #endif  // defined(OS_CHROMEOS)
 
   // Overriden form DisplayController::Observer.
   virtual void OnDisplaysInitialized() OVERRIDE;
   virtual void OnDisplayConfigurationChanging() OVERRIDE;
   virtual void OnDisplayConfigurationChanged() OVERRIDE;
 
  private:
   friend class TouchHudTestBase;
 
   const int64 display_id_;
   aura::Window* root_window_;
 
   views::Widget* widget_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchObserverHUD);
 };
 
 }  // namespace ash
 
 #endif  // ASH_TOUCH_TOUCH_OBSERVER_HUD_H_