Add support for isochronous transfers in WebUSB.

third_party/WebKit/Source/modules/webusb/USBDevice.h

Index: third_party/WebKit/Source/modules/webusb/USBDevice.h
diff --git a/third_party/WebKit/Source/modules/webusb/USBDevice.h b/third_party/WebKit/Source/modules/webusb/USBDevice.h
index b3fa5065d9612d3c9995a0f1a9e0508b1ab53151..a561e08b78070a9680369fc999b090a05e08d68e 100644
--- a/third_party/WebKit/Source/modules/webusb/USBDevice.h
+++ b/third_party/WebKit/Source/modules/webusb/USBDevice.h
@@ -12,6 +12,7 @@
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/webusb/WebUSBDevice.h"
 #include "public/platform/modules/webusb/WebUSBDeviceInfo.h"
+#include "wtf/Vector.h"
 
 namespace blink {
 
@@ -79,6 +80,8 @@ public:
     ScriptPromise clearHalt(ScriptState*, uint8_t endpointNumber);
     ScriptPromise transferIn(ScriptState*, uint8_t endpointNumber, unsigned length);
     ScriptPromise transferOut(ScriptState*, uint8_t endpointNumber, const ArrayBufferOrArrayBufferView& data);
+    ScriptPromise isochronousTransferIn(ScriptState*, uint8_t endpointNumber, Vector<unsigned> packetLengths);
+    ScriptPromise isochronousTransferOut(ScriptState*, uint8_t endpointNumber, const ArrayBufferOrArrayBufferView& data, Vector<unsigned> packetLengths);
     ScriptPromise reset(ScriptState*);
 
     void contextDestroyed() override;