Separate the NTP app ordering from the app list app ordering

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 27 matching lines @@
                    const std::string& extension_id,
                    AppListControllerDelegate* controller,
                    const std::string& extension_name,
                    const gfx::ImageSkia& installing_icon,
                    bool is_platform_app);
   virtual ~ExtensionAppItem();
 
   // Reload the title and icon from the underlying extension.
   void Reload();
 
-  syncer::StringOrdinal GetPageOrdinal() const;
-  syncer::StringOrdinal GetAppLaunchOrdinal() const;
-
   // 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);
 
   // Updates the app item's icon, if necessary adding an overlay and/or making
   // it gray.
   void UpdateIcon();
 
+  // Returns true if this ExtensionAppItem precedes |item| in the app list app
+  // ordering. The item's extension id must be in the app list ordering.
+  bool Precedes(const ExtensionAppItem* item) const;
+
+  // Returns true if thie ExtensionAppItem's extension id is in the app list app
+  // ordering.
+  bool ExistsInSorting();
+
   const std::string& extension_id() const { return extension_id_; }
 
  private:
   // Gets extension associated with this model. Returns NULL if extension
   // no longer exists.
   const extensions::Extension* GetExtension() const;
 
   // Loads extension icon.
   void LoadImage(const extensions::Extension* extension);
 
@@ skipping 37 matching lines @@
   // Icon for the extension if we can't access the installed extension.
   gfx::ImageSkia installing_icon_;
 
   // Whether or not this app is a platform app.
   bool is_platform_app_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppItem);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_ITEM_H_