Separate the NTP app ordering from the app list app ordering

chrome/browser/extensions/extension_sorting.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_EXTENSIONS_EXTENSION_SORTING_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SORTING_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 86 matching lines @@
   int PageStringOrdinalAsInteger(
       const syncer::StringOrdinal& page_ordinal) const;
 
   // Converts the page index integer to its StringOrdinal equivalent. This takes
   // O(# of apps) worst-case.
   syncer::StringOrdinal PageIntegerAsStringOrdinal(size_t page_index);
 
   // Hidden extensions don't appear in the new tab page.
   void MarkExtensionAsHidden(const std::string& extension_id);
 
+  // Returns all extension ids in the sorting in an vector ordered according to
+  // this sorting.
+  void GetOrderedExtensionIds(extensions::ExtensionIdList* out) const;
+
  private:
   // The StringOrdinal is the app launch ordinal and the string is the extension
   // id.
   typedef std::multimap<
       syncer::StringOrdinal, std::string,
     syncer::StringOrdinal::LessThanFn> AppLaunchOrdinalMap;
   // The StringOrdinal is the page ordinal and the AppLaunchOrdinalMap is the
   // contents of that page.
   typedef std::map<
       syncer::StringOrdinal, AppLaunchOrdinalMap,
@@ skipping 98 matching lines @@
   // construction when the app order may not have been determined.
   bool default_ordinals_created_;
 
   // The set of extensions that don't appear in the new tab page.
   std::set<std::string> ntp_hidden_extensions_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSorting);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SORTING_H_