Prevent double inialization of DOMUI pref handlers

chrome/browser/dom_ui/options/options_ui.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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_DOM_UI_OPTIONS_OPTIONS_UI_H_
 #define CHROME_BROWSER_DOM_UI_OPTIONS_OPTIONS_UI_H_
 #pragma once
 
 #include <string>
 
 #include "base/scoped_ptr.h"
@@ skipping 34 matching lines @@
   OptionsPageUIHandler();
   virtual ~OptionsPageUIHandler();
 
   // Is this handler enabled?
   virtual bool IsEnabled();
 
   // Collects localized strings for options page.
   virtual void GetLocalizedValues(DictionaryValue* localized_strings) = 0;
 
   // Initialize the page.  Called once the DOM is available for manipulation.
+  // This will be called only once.
   virtual void Initialize() {}
 
   // Uninitializes the page.  Called just before the object is destructed.
   virtual void Uninitialize() {}
 
   // DOMMessageHandler implementation.
   virtual void RegisterMessages() {}
 
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
@@ skipping 18 matching lines @@
   virtual void RenderViewCreated(RenderViewHost* render_view_host);
   virtual void DidBecomeActiveForReusedRenderView();
 
   void InitializeHandlers();
 
  private:
   // Adds OptionsPageUiHandler to the handlers list if handler is enabled.
   void AddOptionsPageUIHandler(DictionaryValue* localized_strings,
                                OptionsPageUIHandler* handler);
 
+  bool initialized_handlers_;
+
   DISALLOW_COPY_AND_ASSIGN(OptionsUI);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_OPTIONS_OPTIONS_UI_H_