chromeos: Move files in //ash/common to //ash

ash/common/wm/window_state_observer.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_COMMON_WM_WINDOW_STATE_OBSERVER_H_
-#define ASH_COMMON_WM_WINDOW_STATE_OBSERVER_H_
-
-#include "ash/ash_export.h"
-#include "ash/common/wm/wm_types.h"
-
-namespace ash {
-namespace wm {
-class WindowState;
-
-class ASH_EXPORT WindowStateObserver {
- public:
-  virtual ~WindowStateObserver() {}
-
-  // Following observer methods are different from kWindowShowStatekey
-  // property change as they will be invoked when the window
-  // gets left/right maximized, and auto positioned. |old_type| is the value
-  // before the change.
-
-  // Called after the window's state type is set to new type, but before
-  // the window's bounds has been updated for the new type.
-  // This is used to update the shell state such as work area so
-  // that the window can use the correct environment to update its bounds.
-  // TODO(oshima): Remove this once docked windows has its own state.
-  virtual void OnPreWindowStateTypeChange(WindowState* window_state,
-                                          WindowStateType old_type) {}
-
-  // Called after the window's state has been updated.
-  // This is used to update the shell state that depends on the updated
-  // window bounds, such as shelf visibility.
-  virtual void OnPostWindowStateTypeChange(WindowState* window_state,
-                                           WindowStateType old_type) {}
-};
-
-}  // namespace wm
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_WINDOW_STATE_OBSERVER_H_