Sync app order for extension items

chrome/browser/ui/app_list/extension_app_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_EXTENSION_APP_MODEL_BUILDER_H_
 #define CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_MODEL_BUILDER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 11 matching lines @@
 class Extension;
 class InstallTracker;
 }
 
 namespace gfx {
 class ImageSkia;
 }
 
 // This class populates and maintains the given |model| with information from
 // |profile|.
-class ExtensionAppModelBuilder : public extensions::InstallObserver {
+class ExtensionAppModelBuilder : public extensions::InstallObserver,
+                                 public ui::ListModelObserver {
  public:
   ExtensionAppModelBuilder(Profile* profile,
                            app_list::AppListModel* model,
                            AppListControllerDelegate* controller);
   virtual ~ExtensionAppModelBuilder();
 
   // Rebuilds the model with the given profile.
   void SwitchProfile(Profile* profile);
 
  private:
   typedef std::vector<ExtensionAppItem*> ExtensionAppList;
 
-  // Overridden from extensions::InstallObserver:
+  // extensions::InstallObserver
   virtual void OnBeginExtensionInstall(const std::string& extension_id,
                                        const std::string& extension_name,
                                        const gfx::ImageSkia& installing_icon,
                                        bool is_app,
                                        bool is_platform_app) OVERRIDE;
-
   virtual void OnDownloadProgress(const std::string& extension_id,
                                   int percent_downloaded) OVERRIDE;
-
   virtual void OnInstallFailure(const std::string& extension_id) OVERRIDE;
   virtual void OnExtensionInstalled(
       const extensions::Extension* extension) OVERRIDE {}
   virtual void OnExtensionLoaded(
       const extensions::Extension* extension) OVERRIDE;
   virtual void OnExtensionUnloaded(
       const extensions::Extension* extension) OVERRIDE;
   virtual void OnExtensionUninstalled(
       const extensions::Extension* extension) OVERRIDE;
   virtual void OnAppsReordered() OVERRIDE;
   virtual void OnAppInstalledToAppList(
       const std::string& extension_id) OVERRIDE;
   virtual void OnShutdown() OVERRIDE;
 
+  // ui::ListModelObserver
+  virtual void ListItemsAdded(size_t start, size_t count) OVERRIDE;
+  virtual void ListItemsRemoved(size_t start, size_t count) OVERRIDE;
+  virtual void ListItemMoved(size_t index, size_t target_index) OVERRIDE;
+  virtual void ListItemsChanged(size_t start, size_t count) OVERRIDE;
+
   // Adds apps in |extensions| to |apps|.
   void AddApps(const ExtensionSet* extensions, ExtensionAppList* apps);
 
   // Populates the model with apps.
   void PopulateApps();
 
   // Re-sort apps in case app ordinal prefs are changed.
   void ResortApps();
 
   // Inserts an app based on app ordinal prefs.
@@ skipping 26 matching lines @@
   // if we try to highlight an app that doesn't exist in the list yet.
   bool highlighted_app_pending_;
 
   // We listen to this to show app installing progress.
   extensions::InstallTracker* tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppModelBuilder);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_MODEL_BUILDER_H_