Separate the NTP app ordering from the app list app ordering

chrome/browser/extensions/install_tracker.h

 // Copyright 2013 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_INSTALL_TRACKER_H_
 #define CHROME_BROWSER_EXTENSIONS_INSTALL_TRACKER_H_
 
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/extensions/install_observer.h"
+#include "chrome/browser/ui/app_list/app_list_extension_sorting_observer.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
+class AppListExtensionSorting;
 class Profile;
 
 namespace gfx {
 class ImageSkia;
 }
 
 namespace extensions {
 
 class ExtensionPrefs;
 
 class InstallTracker : public BrowserContextKeyedService,
-                       public content::NotificationObserver {
+                       public content::NotificationObserver,
+                       public AppListExtensionSortingObserver {
  public:
   InstallTracker(Profile* profile,
                  extensions::ExtensionPrefs* prefs);
   virtual ~InstallTracker();
 
   void AddObserver(InstallObserver* observer);
   void RemoveObserver(InstallObserver* observer);
 
   void OnBeginExtensionInstall(
       const std::string& extension_id,
       const std::string& extension_name,
       const gfx::ImageSkia& installing_icon,
       bool is_app,
       bool is_platform_app);
   void OnDownloadProgress(const std::string& extension_id,
                           int percent_downloaded);
   void OnInstallFailure(const std::string& extension_id);
 
-  // Overriddes for BrowserContextKeyedService:
+  // Overrides for BrowserContextKeyedService:
   virtual void Shutdown() OVERRIDE;
 
-  // content::NotificationObserver
+  // Overrides for content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // Overrides for AppListExtensionSortingObserver:
+  virtual void OnAppListReordered() OVERRIDE;
+
  private:
-  void OnAppsReordered();
+  void ExtensionPrefsChanged();
 
+  AppListExtensionSorting* app_list_extension_sorting_;
   ObserverList<InstallObserver> observers_;
   content::NotificationRegistrar registrar_;
   PrefChangeRegistrar pref_change_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(InstallTracker);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_INSTALL_TRACKER_H_