Add support for isochronous transfers in WebUSB.

third_party/WebKit/Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 293 matching lines @@
       'websockets/CloseEvent.idl',
       'websockets/WebSocket.idl',
       'webusb/USB.idl',
       'webusb/USBAlternateInterface.idl',
       'webusb/USBEndpoint.idl',
       'webusb/USBConfiguration.idl',
       'webusb/USBConnectionEvent.idl',
       'webusb/USBDevice.idl',
       'webusb/USBInTransferResult.idl',
       'webusb/USBInterface.idl',
+      'webusb/USBIsochronousInTransferPacket.idl',
+      'webusb/USBIsochronousInTransferResult.idl',
+      'webusb/USBIsochronousOutTransferPacket.idl',
+      'webusb/USBIsochronousOutTransferResult.idl',
       'webusb/USBOutTransferResult.idl',
       'worklet/Worklet.idl',
       'worklet/WorkletGlobalScope.idl',
     ],
     # 'partial interface' or target (right side of) 'implements'
     'modules_dependency_idl_files': [
       'audio_output_devices/HTMLMediaElementAudioOutputDevice.idl',
       'background_sync/ServiceWorkerGlobalScopeSync.idl',
       'background_sync/ServiceWorkerRegistrationSync.idl',
       'battery/NavigatorBattery.idl',
@@ skipping 1512 matching lines @@
       'webusb/USBController.h',
       'webusb/USBDevice.cpp',
       'webusb/USBDevice.h',
       'webusb/USBEndpoint.cpp',
       'webusb/USBEndpoint.h',
       'webusb/USBError.cpp',
       'webusb/USBError.h',
       'webusb/USBInTransferResult.h',
       'webusb/USBInterface.cpp',
       'webusb/USBInterface.h',
+      'webusb/USBIsochronousInTransferPacket.h',
+      'webusb/USBIsochronousInTransferResult.h',
+      'webusb/USBIsochronousOutTransferPacket.h',
+      'webusb/USBIsochronousOutTransferResult.h',
       'webusb/USBOutTransferResult.h',
       'worklet/DOMWindowWorklet.cpp',
       'worklet/DOMWindowWorklet.h',
       'worklet/Worklet.cpp',
       'worklet/Worklet.h',
       'worklet/WorkletGlobalScope.cpp',
       'worklet/WorkletGlobalScope.h',
     ],
     # 'partial interface' or target (right side of) 'implements'
     'modules_testing_dependency_idl_files' : [
@@ skipping 62 matching lines @@
       'webaudio/AudioBasicProcessorHandlerTest.cpp',
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }