app_list: Use NTP ordering in ExtensionSorting to sort apps.

chrome/browser/ui/app_list/apps_model_builder.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_APPS_MODEL_BUILDER_H_
 #define CHROME_BROWSER_UI_APP_LIST_APPS_MODEL_BUILDER_H_
 
 #include <string>
-#include <vector>
 
 #include "base/gtest_prod_util.h"
+#include "chrome/browser/api/prefs/pref_change_registrar.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/app_list/app_list_model.h"
 
 class AppListController;
+class ExtensionAppItem;
 class Profile;
 
 class AppsModelBuilder : public content::NotificationObserver {
  public:
   AppsModelBuilder(Profile* profile,
                    app_list::AppListModel::Apps* model,
                    AppListController* controller);
   virtual ~AppsModelBuilder();
 
   // Populates the model.
   void Build();
 
  private:
-  typedef std::vector<app_list::AppListItemModel*> Apps;
+  // Populates the model with apps.
+  void PopulateApps();
 
-  FRIEND_TEST_ALL_PREFIXES(AppsModelBuilderTest, GetExtensionApps);
-  FRIEND_TEST_ALL_PREFIXES(AppsModelBuilderTest, SortAndPopulateModel);
-  FRIEND_TEST_ALL_PREFIXES(AppsModelBuilderTest, InsertItemByTitle);
+  // Gets start and end index of app items in the model.
+  void GetAppsRange(size_t* start, size_t* end);
 
-  void SortAndPopulateModel(const Apps& apps);
-  void InsertItemByTitle(app_list::AppListItemModel* app);
+  // Re-sort apps in case app ordinal prefs are changed.
+  void ResortApps();
 
-  void GetExtensionApps(Apps* apps);
-  void CreateSpecialApps();
+  // Inserts an app based on app ordinal prefs.
+  void InsertApp(ExtensionAppItem* app);
 
   // Returns the index of the application app with |app_id| in |model_|. If
   // no match is found, returns -1.
   int FindApp(const std::string& app_id);
 
   // Sets the application app with |highlight_app_id_| in |model_| as
   // highlighted. If such an app is found, reset |highlight_app_id_| so that it
   // is highlighted once per install notification.
   void HighlightApp();
 
+  // Returns app instance at given |index|.
+  ExtensionAppItem* GetAppAt(size_t index);
+
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   Profile* profile_;
   AppListController* controller_;
 
   // Sub apps model of AppListModel that represents apps grid view.
   app_list::AppListModel::Apps* model_;
 
-  // Number of special apps in the model. Special apps index should be ranged
-  // from [0, special_apps_count_ - 1].
-  int special_apps_count_;
-
   std::string highlight_app_id_;
 
   content::NotificationRegistrar registrar_;
+  PrefChangeRegistrar pref_change_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(AppsModelBuilder);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_APPS_MODEL_BUILDER_H_