When app shortcuts are enabled, do a once-off creation of all shortcuts.

apps/shortcut_manager.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 APPS_SHORTCUT_MANAGER_H_
 #define APPS_SHORTCUT_MANAGER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/common/extensions/extension.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 PrefService;
 class Profile;
 
 namespace apps {
 
 // This class manages the installation of shortcuts for platform apps.
 class ShortcutManager : public BrowserContextKeyedService,
                         public content::NotificationObserver {
  public:
   explicit ShortcutManager(Profile* profile);
 
   virtual ~ShortcutManager();
 
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
+  // Checks if kShortcutsEnabled is set in prefs. If not, this sets it and
+  // creates shortcuts for all apps.
+  void OnceOffCreateShortcuts();
+
   void DeleteApplicationShortcuts(const extensions::Extension* extension);
 
   content::NotificationRegistrar registrar_;
   Profile* profile_;
+  PrefService* prefs_;
 
   // Fields used when installing application shortcuts.
   base::WeakPtrFactory<ShortcutManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ShortcutManager);
 };
 
 }  // namespace apps
 
 #endif  // APPS_SHORTCUT_MANAGER_H_