Re-trying moving AudioElement back to dart:html.

sdk/lib/html/scripts/idlnode.py

 #!/usr/bin/python
 # Copyright (c) 2011, 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.
 
+import os
 import sys
 
 
 class IDLNode(object):
   """Base class for all IDL elements.
   IDLNode may contain various child nodes, and have properties. Examples
   of IDLNode are interfaces, interface members, function arguments,
   etc.
   """
 
@@ skipping 363 matching lines @@
 
   def __init__(self, ast):
     IDLNode.__init__(self, ast)
     self._convert_ext_attrs(ast)
     self._convert_annotations(ast)
     self.parents = self._convert_all(ast, 'ParentInterface',
       IDLParentInterface)
     javascript_interface_name = self.ext_attrs.get('InterfaceName', self.id)
     self.javascript_binding_name = javascript_interface_name
     self.doc_js_name = javascript_interface_name
-    self.operations = self._convert_all(ast, 'Operation', 
+    self.operations = self._convert_all(ast, 'Operation',
       lambda ast: IDLOperation(ast, self.doc_js_name))
     self.attributes = self._convert_all(ast, 'Attribute',
       lambda ast: IDLAttribute(ast, self.doc_js_name))
     self.constants = self._convert_all(ast, 'Const',
       lambda ast: IDLConstant(ast, self.doc_js_name))
     self.is_supplemental = 'Supplemental' in self.ext_attrs
     self.is_no_interface_object = 'NoInterfaceObject' in self.ext_attrs
     self.is_fc_suppressed = 'Suppressed' in self.ext_attrs
 
   def reset_id(self, new_id):
@@ skipping 114 matching lines @@
   """IDLDictNode specialization for one annotation."""
   def __init__(self, ast=None):
     IDLDictNode.__init__(self, ast)
     self.id = None
     if not ast:
       return
     for arg in self._find_all(ast, 'AnnotationArg'):
       name = self._find_first(arg, 'Id')
       value = self._find_first(arg, 'AnnotationArgValue')
       self[name] = value