Merge components/usb_service into device/usb.

components/usb_service/usb_service.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 COMPONENTS_USB_SERVICE_USB_SERVICE_H_
-#define COMPONENTS_USB_SERVICE_USB_SERVICE_H_
-
-#include <vector>
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/threading/non_thread_safe.h"
-#include "components/usb_service/usb_service_export.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace usb_service {
-
-class UsbDevice;
-
-// The USB service handles creating and managing an event handler thread that is
-// used to manage and dispatch USB events. It is also responsible for device
-// discovery on the system, which allows it to re-use device handles to prevent
-// competition for the same USB device.
-class USB_SERVICE_EXPORT UsbService : public base::NonThreadSafe {
- public:
-  // Must be called on a thread with a MessageLoopForIO (for example
-  // BrowserThread::FILE). The UI task runner reference is used to talk to the
-  // PermissionBrokerClient on ChromeOS (UI thread). Returns NULL when
-  // initialization fails.
-  static UsbService* GetInstance(
-      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
-
-  static void SetInstanceForTest(UsbService* instance);
-
-  virtual scoped_refptr<UsbDevice> GetDeviceById(uint32 unique_id) = 0;
-
-  // Get all of the devices attached to the system, inserting them into
-  // |devices|. Clears |devices| before use. The result will be sorted by id
-  // in increasing order. Must be called on FILE thread.
-  virtual void GetDevices(std::vector<scoped_refptr<UsbDevice> >* devices) = 0;
-
- protected:
-  friend struct base::DefaultDeleter<UsbService>;
-  UsbService() {}
-  virtual ~UsbService() {}
-  DISALLOW_COPY_AND_ASSIGN(UsbService);
-};
-
-}  // namespace usb_service
-
-#endif  // COMPONENTS_USB_SERVICE_USB_SERVICE_H_