Make packaged apps use AppNonClientFrameViewAsh when maximized

ash/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_WM_WINDOW_STATE_OBSERVER_H_
 #define ASH_WM_WINDOW_STATE_OBSERVER_H_
 
+#include "ash/ash_export.h"
 #include "ash/wm/wm_types.h"
 
 namespace ash {
 namespace wm {
 class WindowState;
 
 class ASH_EXPORT WindowStateObserver {
  public:
   // Called when the tracked_by_workspace has changed.
   virtual void OnTrackedByWorkspaceChanged(
       WindowState* window,
       bool old_value) {}
 
   // Called when the window's show type has changed.
   // This is different from kWindowShowStatekey property change
   // as this will be invoked when the window gets left/right maximized,
   // and auto positioned.
   virtual void OnWindowShowTypeChanged(WindowState* window_state,
                                        WindowShowType type) {}
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_STATE_OBSERVER_H_