Add support for isochronous transfers in WebUSB.

content/renderer/usb/web_usb_device_impl.h

 // Copyright 2015 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 CONTENT_RENDERER_USB_WEB_USB_DEVICE_IMPL_H_
 #define CONTENT_RENDERER_USB_WEB_USB_DEVICE_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 39 matching lines @@
                     uint8_t alternate_setting,
                     blink::WebUSBDeviceSetInterfaceAlternateSettingCallbacks*
                         callbacks) override;
   void clearHalt(uint8_t endpoint_number,
                  blink::WebUSBDeviceClearHaltCallbacks* callbacks) override;
   void controlTransfer(
       const blink::WebUSBDevice::ControlTransferParameters& parameters,
       uint8_t* data,
       size_t data_size,
       unsigned int timeout,
-      blink::WebUSBDeviceControlTransferCallbacks* callbacks) override;
+      blink::WebUSBDeviceTransferCallbacks* callbacks) override;
   void transfer(blink::WebUSBDevice::TransferDirection direction,
                 uint8_t endpoint_number,
                 uint8_t* data,
                 size_t data_size,
                 unsigned int timeout,
-                blink::WebUSBDeviceBulkTransferCallbacks* callbacks) override;
+                blink::WebUSBDeviceTransferCallbacks* callbacks) override;
+  void isochronousTransfer(
+      blink::WebUSBDevice::TransferDirection direction,
+      uint8_t endpoint_number,
+      uint8_t* data,
+      size_t data_size,
+      blink::WebVector<uint32_t> packet_lengths,
+      unsigned int timeout,
+      blink::WebUSBDeviceTransferCallbacks* callbacks) override;
   void reset(blink::WebUSBDeviceResetCallbacks* callbacks) override;
 
   device::usb::DevicePtr device_;
   blink::WebUSBDeviceInfo device_info_;
 
   base::WeakPtrFactory<WebUSBDeviceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUSBDeviceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_USB_WEB_USB_DEVICE_IMPL_H_