Adding UsbService and UsbDevice constructs.

chrome/browser/usb/usb_service_factory.h

+// Copyright (c) 2012 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_USB_USB_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_USB_USB_SERVICE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+
+class Profile;
+class UsbService;
+
+class UsbServiceFactory : public ProfileKeyedServiceFactory {
+ public:
+  static UsbService* GetForProfile(Profile* profile);
+  static bool HasUsbService(Profile* profile);
+
+  static UsbServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<UsbServiceFactory>;
+
+  UsbServiceFactory();
+  virtual ~UsbServiceFactory();
+
+  virtual ProfileKeyedService* BuildServiceInstanceFor(
+      Profile* profile) const OVERRIDE;
+};
+
+#endif  // CHROME_BROWSER_USB_USB_SERVICE_FACTORY_H_