Add a service to track devices selected by the user.

apps/saved_devices_service_factory.h

Index: apps/saved_devices_service_factory.h
diff --git a/apps/saved_devices_service_factory.h b/apps/saved_devices_service_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..d1b39a106745aa0673cc01c088e1f8549a1ec921
--- /dev/null
+++ b/apps/saved_devices_service_factory.h
@@ -0,0 +1,35 @@
+// 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.
+
+#ifndef APPS_SAVED_DEVICES_SERVICE_FACTORY_H_
+#define APPS_SAVED_DEVICES_SERVICE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+class Profile;
+
+namespace apps {
+
+class SavedDevicesService;
+
+// BrowserContextKeyedServiceFactory for SavedDevicesService.
+class SavedDevicesServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static SavedDevicesService* GetForProfile(Profile* profile);
+
+  static SavedDevicesServiceFactory* GetInstance();
+
+ private:
+  SavedDevicesServiceFactory();
+  virtual ~SavedDevicesServiceFactory();
+  friend struct DefaultSingletonTraits<SavedDevicesServiceFactory>;
+
+  virtual KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const OVERRIDE;
+};
+
+}  // namespace apps
+
+#endif  // APPS_SAVED_DEVICES_SERVICE_FACTORY_H_