Adding UsbService and UsbDevice constructs.

chrome/browser/usb/usb_service_factory.cc

+// 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.
+
+#include "chrome/browser/usb/usb_service_factory.h"
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/profiles/profile_dependency_manager.h"
+#include "chrome/browser/usb/usb_service.h"
+
+UsbServiceFactory* UsbServiceFactory::GetInstance() {
+  return Singleton<UsbServiceFactory>::get();
+}
+
+UsbService* UsbServiceFactory::GetForProfile(Profile* profile) {
+  return static_cast<UsbService*>(
+      GetInstance()->GetServiceForProfile(profile, true));
+}
+
+UsbServiceFactory::UsbServiceFactory() : ProfileKeyedServiceFactory(
+    "UsbService", ProfileDependencyManager::GetInstance()) {}
+
+UsbServiceFactory::~UsbServiceFactory() {}
+
+ProfileKeyedService* UsbServiceFactory::BuildServiceInstanceFor(
+    Profile* profile) const {
+  return new UsbService();
+}