Adding tests for USB extension API

chrome/browser/extensions/api/usb/usb_device_resource.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_EXTENSIONS_API_USB_USB_DEVICE_RESOURCE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_USB_USB_DEVICE_RESOURCE_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 14 matching lines @@
 class ApiResourceEventNotifier;
 
 // A UsbDeviceResource is an ApiResource wrapper for a UsbDevice. When invoking
 // transfers on the underlying device it will use the ApiResourceEventNotifier
 // associated with the underlying ApiResource to deliver completion messages.
 class UsbDeviceResource : public ApiResource {
  public:
   UsbDeviceResource(ApiResourceEventNotifier* notifier, UsbDevice* device);
   virtual ~UsbDeviceResource();
 
+  void Close();
+
   // All of the *Transfer variants that are exposed here adapt their arguments
   // for the underlying UsbDevice's interface and invoke the corresponding
   // methods with completion callbacks that call OnTransferComplete on the event
   // notifier.
   void ControlTransfer(
       const api::experimental_usb::ControlTransferInfo& transfer);
   void InterruptTransfer(
       const api::experimental_usb::GenericTransferInfo& transfer);
   void BulkTransfer(const api::experimental_usb::GenericTransferInfo& transfer);
   void IsochronousTransfer(
       const api::experimental_usb::IsochronousTransferInfo& transfer);
 
  private:
   // Invoked by the underlying device's transfer callbacks. Indicates transfer
   // completion to the ApiResource's event notifier.
   void TransferComplete(net::IOBuffer* buffer, const size_t length,
                         UsbTransferStatus status);
 
   scoped_refptr<UsbDevice> device_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbDeviceResource);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_USB_USB_DEVICE_RESOURCE_H_