Add support for persistent file access in apps.

apps/saved_files_service_factory.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 APPS_SAVED_FILES_SERVICE_FACTORY_H_
+#define APPS_SAVED_FILES_SERVICE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+
+class Profile;
+
+namespace apps {
+
+class SavedFilesService;
+
+// BrowserContextKeyedServiceFactory for SavedFilesService.
+class SavedFilesServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static SavedFilesService* GetForProfile(Profile* profile);
+
+  static SavedFilesServiceFactory* GetInstance();
+
+ private:
+  SavedFilesServiceFactory();
+  virtual ~SavedFilesServiceFactory();
+  friend struct DefaultSingletonTraits<SavedFilesServiceFactory>;
+
+  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const OVERRIDE;
+};
+
+}  // namespace apps
+
+#endif  // APPS_SAVED_FILES_SERVICE_FACTORY_H_