Add a service to track devices selected by the user.

apps/saved_devices_service_factory.cc

Index: apps/saved_devices_service_factory.cc
diff --git a/apps/saved_devices_service_factory.cc b/apps/saved_devices_service_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1153eac0359355fa1e82d3aad449c3238a8d7357
--- /dev/null
+++ b/apps/saved_devices_service_factory.cc
@@ -0,0 +1,39 @@
+// Copyright 2014 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_devices_service_factory.h"
+
+#include "apps/saved_devices_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+namespace apps {
+
+// static
+SavedDevicesService* SavedDevicesServiceFactory::GetForProfile(
+    Profile* profile) {
+  return static_cast<SavedDevicesService*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}
+
+// static
+SavedDevicesServiceFactory* SavedDevicesServiceFactory::GetInstance() {
+  return Singleton<SavedDevicesServiceFactory>::get();
+}
+
+SavedDevicesServiceFactory::SavedDevicesServiceFactory()
+    : BrowserContextKeyedServiceFactory(
+          "SavedDevicesService",
+          BrowserContextDependencyManager::GetInstance()) {
+}
+
+SavedDevicesServiceFactory::~SavedDevicesServiceFactory() {
+}
+
+KeyedService* SavedDevicesServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* profile) const {
+  return new SavedDevicesService(static_cast<Profile*>(profile));
+}
+
+}  // namespace apps