Save display preference when all display configuration changes has been completed.

chrome/browser/chromeos/display/primary_display_switch_observer.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 CHROME_BROWSER_CHROMEOS_DISPLAY_PRIMARY_DISPLAY_SWITCH_OBSERVER_H_
-#define CHROME_BROWSER_CHROMEOS_DISPLAY_PRIMARY_DISPLAY_SWITCH_OBSERVER_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "ui/aura/root_window_observer.h"
-#include "ui/aura/window_observer.h"
-
-namespace aura {
-class RootWindow;
-}
-
-namespace gfx {
-class Point;
-}
-
-namespace chromeos {
-
-// PrimaryDisplaySwitchObserver observes the change of the primary/secondary
-// displays and store the current primary display ID into the local preference.
-class PrimaryDisplaySwitchObserver : public aura::RootWindowObserver,
-                                     public aura::WindowObserver {
- public:
-  PrimaryDisplaySwitchObserver();
-  virtual ~PrimaryDisplaySwitchObserver();
-
- protected:
-  // aura::RootWindowObserver overrides:
-  virtual void OnRootWindowMoved(const aura::RootWindow* root_window,
-                                 const gfx::Point& new_origin) OVERRIDE;
-  // aura::WindowObserver overrides:
-  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
-
-  aura::RootWindow* primary_root_;
-
-  DISALLOW_COPY_AND_ASSIGN(PrimaryDisplaySwitchObserver);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_DISPLAY_PRIMARY_DISPLAY_SWITCH_OBSERVER_H_