Changed to use JSInterop

tools/dom/scripts/htmldartgenerator.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 the system to generate
 dart:html APIs from the IDL database."""
 
 import emitter
 from generator import AnalyzeOperation, ConstantOutputOrder, \
@@ skipping 768 matching lines @@
     # returned in generated code.
     assert(dart_name != 'HistoryBase' and dart_name != 'LocationBase')
     if dart_name == 'Window':
       return _secure_base_types[dart_name]
     return dart_name
 
   def SecureBaseName(self, type_name):
     if type_name in _secure_base_types:
       return _secure_base_types[type_name]
 
+  def is_DOM_type(self, type_name):
+    try:
+        self._type_registry.TypeInfo(type_name)
+        return True
+    except RuntimeError:
+        return False
+
   def _NarrowToImplementationType(self, type_name):
     return self._type_registry.TypeInfo(type_name).narrow_dart_type()
 
   def _NarrowInputType(self, type_name):
     return self._NarrowToImplementationType(type_name)
 
   def _DartType(self, type_name):
     return self._type_registry.DartType(type_name)
 
   def _TypeInfo(self, type_name):
     return self._type_registry.TypeInfo(type_name)