Add webkitAudioPannerNode as an optional name

tools/dom/scripts/generator.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for systems to generate
 Dart APIs from the IDL database."""
 
 import copy
 import json
@@ skipping 143 matching lines @@
     'MouseEvent': 'MouseEvent,DragEvent,PointerEvent,MSPointerEvent',
 
     'MutationObserver': 'MutationObserver,WebKitMutationObserver',
 
     'NamedNodeMap': 'NamedNodeMap,MozNamedAttrMap',
 
     'NodeList': 'NodeList,RadioNodeList',
 
     'OscillatorNode': 'OscillatorNode,Oscillator',
 
-    'PannerNode': 'PannerNode,AudioPannerNode',
+    'PannerNode': 'PannerNode,AudioPannerNode,webkitAudioPannerNode',
 
     'RTCPeerConnection': 'RTCPeerConnection,mozRTCPeerConnection',
 
     'RTCIceCandidate': 'RTCIceCandidate,mozRTCIceCandidate',
 
     'RTCSessionDescription': 'RTCSessionDescription,mozRTCSessionDescription',
 
     'RTCDataChannel': 'RTCDataChannel,DataChannel',
 
     'ScriptProcessorNode': 'ScriptProcessorNode,JavaScriptAudioNode',
@@ skipping 1166 matching lines @@
     if type_data.clazz == 'BasicTypedList':
       if type_name == 'ArrayBuffer':
         dart_interface_name = 'ByteBuffer'
       else:
         dart_interface_name = self._renamer.RenameInterfaceId(type_name)
       return BasicTypedListIDLTypeInfo(
           type_name, type_data, dart_interface_name, self)
 
     class_name = '%sIDLTypeInfo' % type_data.clazz
     return globals()[class_name](type_name, type_data)