Add support for reading USB descriptors to the new Windows backend.

device/usb/usb_device.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 DEVICE_USB_USB_DEVICE_H_
 #define DEVICE_USB_USB_DEVICE_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 114 matching lines @@
   base::string16 manufacturer_string_;
   base::string16 product_string_;
   base::string16 serial_number_;
   std::unique_ptr<WebUsbAllowedOrigins> webusb_allowed_origins_;
   GURL webusb_landing_page_;
 
  private:
   friend class base::RefCountedThreadSafe<UsbDevice>;
   friend class UsbDeviceHandleImpl;
   friend class UsbDeviceHandleUsbfs;
+  friend class UsbDeviceHandleWin;
   friend class UsbServiceAndroid;
   friend class UsbServiceImpl;
   friend class UsbServiceLinux;
   friend class UsbServiceWin;
 
   void OnDisconnect();
   void HandleClosed(UsbDeviceHandle* handle);
 
   const std::string guid_;
 
   // The current device configuration descriptor. May be null if the device is
   // in an unconfigured state; if not null, it is a pointer to one of the
   // items in |descriptor_.configurations|.
   const UsbConfigDescriptor* active_configuration_ = nullptr;
 
   // Weak pointers to open handles. HandleClosed() will be called before each
   // is freed.
   std::list<UsbDeviceHandle*> handles_;
 
   base::ObserverList<Observer, true> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbDevice);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_USB_USB_DEVICE_H_