[fsp] Introduce file_system_provider::Service class for the FileSystemProvider API.

chrome/browser/chromeos/file_system_provider/service_factory.h

+// 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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_FACTORY_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+#include "content/public/browser/browser_context.h"
+
+namespace chromeos {
+namespace file_system_provider {
+
+class Service;
+
+// Creates services per profile.
+class ServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static Service* Get(content::BrowserContext* context);
+  static ServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<ServiceFactory>;
+
+  ServiceFactory();
+  virtual ~ServiceFactory();
+
+  // BrowserContextKeyedServiceFactory overrides:
+  virtual KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const OVERRIDE;
+  virtual bool ServiceIsCreatedWithBrowserContext() const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceFactory);
+};
+
+}  // namespace file_system_provider
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_FACTORY_H_