Adding tests for USB extension API

chrome/browser/usb/usb_device.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_DEVICE_H_
 #define CHROME_BROWSER_USB_USB_DEVICE_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 37 matching lines @@
   enum TransferRecipient { DEVICE, INTERFACE, ENDPOINT, OTHER };
 
   // Usually you will not want to directly create a UsbDevice, favoring to let
   // the UsbService take care of the logistics of getting a platform device
   // handle and handling events for it.
   UsbDevice(UsbService* service, PlatformUsbDeviceHandle handle);
 
   PlatformUsbDeviceHandle handle() { return handle_; }
 
   // Close the USB device and release the underlying platform device.
-  void Close();
+  virtual void Close();
 
-  void ControlTransfer(const TransferDirection direction,
-                       const TransferRequestType request_type,
-                       const TransferRecipient recipient,
-                       const uint8 request,
-                       const uint16 value,
-                       const uint16 index,
-                       net::IOBuffer* buffer,
-                       const size_t length,
-                       const unsigned int timeout,
-                       const UsbTransferCallback& callback);
+  virtual void ControlTransfer(const TransferDirection direction,
+                               const TransferRequestType request_type,
+                               const TransferRecipient recipient,
+                               const uint8 request,
+                               const uint16 value,
+                               const uint16 index,
+                               net::IOBuffer* buffer,
+                               const size_t length,
+                               const unsigned int timeout,
+                               const UsbTransferCallback& callback);
 
-  void BulkTransfer(const TransferDirection direction,
-                    const uint8 endpoint,
-                    net::IOBuffer* buffer,
-                    const size_t length,
-                    const unsigned int timeout,
-                    const UsbTransferCallback& callback);
+  virtual void BulkTransfer(const TransferDirection direction,
+                            const uint8 endpoint,
+                            net::IOBuffer* buffer,
+                            const size_t length,
+                            const unsigned int timeout,
+                            const UsbTransferCallback& callback);
 
-  void InterruptTransfer(const TransferDirection direction,
-                         const uint8 endpoint,
-                         net::IOBuffer* buffer,
-                         const size_t length,
-                         const unsigned int timeout,
-                         const UsbTransferCallback& callback);
+  virtual void InterruptTransfer(const TransferDirection direction,
+                                 const uint8 endpoint,
+                                 net::IOBuffer* buffer,
+                                 const size_t length,
+                                 const unsigned int timeout,
+                                 const UsbTransferCallback& callback);
 
-  void IsochronousTransfer(const TransferDirection direction,
-                           const uint8 endpoint,
-                           net::IOBuffer* buffer,
-                           const size_t length,
-                           const unsigned int packets,
-                           const unsigned int packet_length,
-                           const unsigned int timeout,
-                           const UsbTransferCallback& callback);
+  virtual void IsochronousTransfer(const TransferDirection direction,
+                                   const uint8 endpoint,
+                                   net::IOBuffer* buffer,
+                                   const size_t length,
+                                   const unsigned int packets,
+                                   const unsigned int packet_length,
+                                   const unsigned int timeout,
+                                   const UsbTransferCallback& callback);
 
   // Normal code should not call this function. It is called by the platform's
   // callback mechanism in such a way that it cannot be made private. Invokes
   // the callbacks associated with a given transfer, and removes it from the
   // in-flight transfer set.
   void TransferComplete(PlatformUsbTransferHandle transfer);
 
+ protected:
+  // This constructor variant is for use in testing only.
+  UsbDevice();
+
+  friend class base::RefCounted<UsbDevice>;
+  virtual ~UsbDevice();
+
  private:
   struct Transfer {
     Transfer();
     ~Transfer();
 
     scoped_refptr<net::IOBuffer> buffer;
     UsbTransferCallback callback;
   };
 
-  friend class base::RefCounted<UsbDevice>;
-  virtual ~UsbDevice();
-
   // Checks that the device has not yet been closed.
   void CheckDevice();
 
   // Submits a transfer and starts tracking it. Retains the buffer and copies
   // the completion callback until the transfer finishes, whereupon it invokes
   // the callback then releases the buffer.
   void SubmitTransfer(PlatformUsbTransferHandle handle, net::IOBuffer* buffer,
                       const UsbTransferCallback& callback);
 
   // The UsbService isn't referenced here to prevent a dependency cycle between
   // the service and the devices. Since a service owns every device, and is
   // responsible for its destruction, there is no case where a UsbDevice can
   // have outlived its originating UsbService.
   UsbService* const service_;
   PlatformUsbDeviceHandle handle_;
 
   // transfers_ tracks all in-flight transfers associated with this device,
   // allowing the device to retain the buffer and callback associated with a
   // transfer until such time that it completes. It is protected by lock_.
   base::Lock lock_;
   std::map<PlatformUsbTransferHandle, Transfer> transfers_;
 
   DISALLOW_EVIL_CONSTRUCTORS(UsbDevice);
 };
 
 #endif  // CHROME_BROWSER_USB_USB_DEVICE_H_