Add support for persistent file access in apps.

apps/saved_files_service_factory.cc

+// 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.
+
+#include "apps/saved_files_service_factory.h"
+
+#include "apps/saved_files_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
+
+namespace apps {
+
+// static
+SavedFilesService* SavedFilesServiceFactory::GetForProfile(Profile* profile) {
+  return static_cast<SavedFilesService*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}
+
+// static
+SavedFilesServiceFactory* SavedFilesServiceFactory::GetInstance() {
+  return Singleton<SavedFilesServiceFactory>::get();
+}
+
+SavedFilesServiceFactory::SavedFilesServiceFactory()
+    : BrowserContextKeyedServiceFactory(
+          "SavedFilesService",
+          BrowserContextDependencyManager::GetInstance()) {}
+
+SavedFilesServiceFactory::~SavedFilesServiceFactory() {}
+
+BrowserContextKeyedService* SavedFilesServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* profile) const {
+  return new SavedFilesService(static_cast<Profile*>(profile));
+}
+
+}  // namespace apps