Add support for persistent file access in apps.

chrome/browser/extensions/api/file_system/saved_files_service_factory.cc

Index: chrome/browser/extensions/api/file_system/saved_files_service_factory.cc
diff --git a/chrome/browser/extensions/api/file_system/saved_files_service_factory.cc b/chrome/browser/extensions/api/file_system/saved_files_service_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..738faca8a687483c45ecdd534ebd882126e8e9e1
--- /dev/null
+++ b/chrome/browser/extensions/api/file_system/saved_files_service_factory.cc
@@ -0,0 +1,35 @@
+// Copyright (c) 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.
+
+#include "chrome/browser/extensions/api/file_system/saved_files_service_factory.h"
+
+#include "chrome/browser/extensions/api/file_system/saved_files_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_dependency_manager.h"
+
+namespace extensions {
+
+// static
+SavedFilesService* SavedFilesServiceFactory::GetForProfile(Profile* profile) {
+  return static_cast<SavedFilesService*>(
+      GetInstance()->GetServiceForProfile(profile, true));
+}
+
+// static
+SavedFilesServiceFactory* SavedFilesServiceFactory::GetInstance() {
+  return Singleton<SavedFilesServiceFactory>::get();
+}
+
+SavedFilesServiceFactory::SavedFilesServiceFactory()
+    : ProfileKeyedServiceFactory("SavedFilesService",
+                                 ProfileDependencyManager::GetInstance()) {}
+
+SavedFilesServiceFactory::~SavedFilesServiceFactory() {}
+
+ProfileKeyedService* SavedFilesServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* profile) const {
+  return new SavedFilesService(static_cast<Profile*>(profile));
+}
+
+}  // namespace extensions