Update json_schema_compiler to handle the Automation extension API

tools/json_schema_compiler/idl_schema_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import idl_schema
 import unittest
 
 from json_parse import OrderedDict
 
@@ skipping 52 matching lines @@
   def testArrayOfCallbacks(self):
     schema = idl_schema.Load('test/idl_function_types.idl')[0]
     expected = [{'type': 'array', 'name': 'callbacks',
                  'items':{'type': 'function', 'name': 'MyCallback',
                           'parameters':[{'type': 'integer', 'name': 'x'}]}}]
     self.assertEquals(expected, getParams(schema, 'whatever'))
 
   def testLegalValues(self):
     self.assertEquals({
         'x': {'name': 'x', 'type': 'integer', 'enum': [1,2],
-              'description': 'This comment tests "double-quotes".'},
+              'description': 'This comment tests "double-quotes".',
+              'jsexterns': None},
         'y': {'name': 'y', 'type': 'string'},
         'z': {'name': 'z', 'type': 'string'},
         'a': {'name': 'a', 'type': 'string'},
         'b': {'name': 'b', 'type': 'string'},
         'c': {'name': 'c', 'type': 'string'}},
       getType(self.idl_basics, 'MyType1')['properties'])
 
   def testMemberOrdering(self):
     self.assertEquals(
         ['x', 'y', 'z', 'a', 'b', 'c'],
@@ skipping 311 matching lines @@
                  }]
                }]
 
     self.assertEquals(expected, badabish_params)
 
   def testProperties(self):
     schema = idl_schema.Load('test/idl_properties.idl')[0]
     self.assertEquals(OrderedDict([
       ('first', OrderedDict([
         ('description', 'Integer property.'),
+        ('jsexterns', None),
         ('type', 'integer'),
         ('value', 42),
       ])),
       ('second', OrderedDict([
         ('description', 'Double property.'),
+        ('jsexterns', None),
         ('type', 'number'),
         ('value', 42.0),
       ])),
       ('third', OrderedDict([
         ('description', 'String property.'),
+        ('jsexterns', None),
         ('type', 'string'),
         ('value', 'hello world'),
       ])),
       ('fourth', OrderedDict([
         ('description', 'Unvalued property.'),
+        ('jsexterns', None),
         ('type', 'integer'),
       ])),
     ]), schema.get('properties'))
 
 
 if __name__ == '__main__':
   unittest.main()