Use Ash's ShelfWindowWatcher for app panel windows.

ash/common/test/test_shelf_item_delegate.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_TEST_TEST_SHELF_ITEM_DELEGATE_H_
 #define ASH_COMMON_TEST_TEST_SHELF_ITEM_DELEGATE_H_
 
 #include "ash/common/shelf/shelf_item_delegate.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
@@ skipping 13 matching lines @@
   void set_is_draggable(bool is_draggable) { is_draggable_ = is_draggable; }
 
   // ShelfItemDelegate:
   ShelfItemDelegate::PerformedAction ItemSelected(
       const ui::Event& event) override;
   base::string16 GetTitle() override;
   ShelfMenuModel* CreateApplicationMenu(int event_flags) override;
   bool IsDraggable() override;
   bool CanPin() const override;
   bool ShouldShowTooltip() override;
+  bool IsOpen() const override;
   void Close() override;
 
  private:
   WmWindow* window_;
 
   bool is_draggable_;
 
   DISALLOW_COPY_AND_ASSIGN(TestShelfItemDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_COMMON_TEST_TEST_SHELF_ITEM_DELEGATE_H_