Created new PanelStrip base class and make DockedPanelStrip and OverflowPanelStrip its subclasses.

chrome/browser/ui/panels/panel_manager.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_UI_PANELS_PANEL_MANAGER_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_
 #pragma once
 
 #include <vector>
 #include "base/basictypes.h"
@@ skipping 19 matching lines @@
   static bool ShouldUsePanels(const std::string& extension_id);
 
   // Called when the display is changed, i.e. work area is updated.
   void OnDisplayChanged();
 
   // Creates a panel and returns it. The panel might be queued for display
   // later.
   Panel* CreatePanel(Browser* browser);
 
   void Remove(Panel* panel);
-  void RemoveAll();
+
+  // Close all panels (asynchronous). Panels will be removed after closing.
+  void CloseAll();
 
   // Asynchronous confirmation of panel having been removed.
   void OnPanelRemoved(Panel* panel);
 
   // Drags the given panel.
   void StartDragging(Panel* panel);
   void Drag(int delta_x);
   void EndDragging(bool cancelled);
 
   // Invoked when a panel's expansion state changes.
@@ skipping 139 matching lines @@
   // Timer used to track if the current active app is in full screen mode.
   base::RepeatingTimer<PanelManager> full_screen_mode_timer_;
 
   // True if current active app is in full screen mode.
   bool is_full_screen_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelManager);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_