Persist the order of extensions in the browser action toolbar across sessions...

chrome/browser/extensions/extension_toolbar_model.h

 // Copyright (c) 2009 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_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_
 
 #include "base/observer_list.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/notification_observer.h"
@@ skipping 34 matching lines @@
   ExtensionList::iterator end() {
     return toolitems_.end();
   }
 
  private:
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
+  // To be called after the extension service is ready; gets loaded extensions
+  // from the extension service and their saved order from the pref service
+  // and constructs |toolitems_| from these data.
+  void InitializeExtensionList();
+
+  // Save the model to prefs.
+  void UpdatePrefs();
+
   // Our observers.
   ObserverList<Observer> observers_;
 
   void AddExtension(Extension* extension);
   void RemoveExtension(Extension* extension);
 
   // Our ExtensionsService, guaranteed to outlive us.
   ExtensionsService* service_;
 
   // Ordered list of browser action buttons.
   ExtensionList toolitems_;
 
   NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_