Sync app order for extension items

chrome/browser/ui/app_list/extension_app_item.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_APP_LIST_EXTENSION_APP_ITEM_H_
 #define CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_ITEM_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 30 matching lines @@
                    bool is_platform_app);
   virtual ~ExtensionAppItem();
 
   // Reload the title and icon from the underlying extension.
   void Reload();
 
   // Updates the app item's icon, if necessary adding an overlay and/or making
   // it gray.
   void UpdateIcon();
 
+  // Update page and app launcher ordinals to put the app in between |prev| and
+  // |next|. Note that |prev| and |next| could be NULL when the app is put at
+  // the beginning or at the end.
+  void Move(const ExtensionAppItem* prev, const ExtensionAppItem* next);
+
   const std::string& extension_id() const { return extension_id_; }
 
   static const char kAppType[];
 
  private:
   // Gets extension associated with this model. Returns NULL if extension
   // no longer exists.
   const extensions::Extension* GetExtension() const;
 
   // Loads extension icon.
@@ skipping 46 matching lines @@
 
   // Cache initial sort order. Sort order is not synced with the extensions
   // app ordering once apps are loaded. This will be ignored (or overridden)
   // once the app list is synced.
   std::string sort_order_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppItem);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_ITEM_H_