Moves ShellObserver to ash/common

ash/shell_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 ASH_SHELL_OBSERVER_H_
-#define ASH_SHELL_OBSERVER_H_
-
-#include "ash/ash_export.h"
-#include "ash/common/login_status.h"
-
-namespace ash {
-
-class WmWindow;
-
-class ASH_EXPORT ShellObserver {
- public:
-  // Invoked after the screen's work area insets changes.
-  virtual void OnDisplayWorkAreaInsetsChanged() {}
-
-  // Invoked when the user logs in.
-  virtual void OnLoginStateChanged(LoginStatus status) {}
-
-  // Invoked when the application is exiting.
-  virtual void OnAppTerminating() {}
-
-  // Invoked when the screen is locked (after the lock window is visible) or
-  // unlocked.
-  virtual void OnLockStateChanged(bool locked) {}
-
-  // Called when a casting session is started or stopped.
-  virtual void OnCastingSessionStartedOrStopped(bool started) {}
-
-  // Invoked after a non-primary root window is created.
-  virtual void OnRootWindowAdded(WmWindow* root_window) {}
-
-  // Invoked after the shelf has been created for |root_window|.
-  virtual void OnShelfCreatedForRootWindow(WmWindow* root_window) {}
-
-  // Invoked when the shelf alignment in |root_window| is changed.
-  virtual void OnShelfAlignmentChanged(WmWindow* root_window) {}
-
-  // Invoked when the shelf auto-hide behavior in |root_window| is changed.
-  virtual void OnShelfAutoHideBehaviorChanged(WmWindow* root_window) {}
-
-  // Invoked when the projection touch HUD is toggled.
-  virtual void OnTouchHudProjectionToggled(bool enabled) {}
-
-  // Invoked when entering or exiting fullscreen mode in |root_window|.
-  virtual void OnFullscreenStateChanged(bool is_fullscreen,
-                                        WmWindow* root_window) {}
-
-  // Called when the overview mode is about to be started (before the windows
-  // get re-arranged).
-  virtual void OnOverviewModeStarting() {}
-
-  // Called after overview mode has ended.
-  virtual void OnOverviewModeEnded() {}
-
-  // Called when the always maximize mode has started. Windows might still
-  // animate though.
-  virtual void OnMaximizeModeStarted() {}
-
-  // Called when the always maximize mode has ended. Windows may still be
-  // animating but have been restored.
-  virtual void OnMaximizeModeEnded() {}
-
-  // Called at the end of Shell::Init.
-  virtual void OnShellInitialized() {}
-
- protected:
-  virtual ~ShellObserver() {}
-};
-
-}  // namespace ash
-
-#endif  // ASH_SHELL_OBSERVER_H_