Fix for getContextAttributes which wraps bare dictionary into a Dart type.

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 518 matching lines @@
     # as a parameter / setter.
     'Window get':
       Conversion('_convertNativeToDart_Window', 'dynamic', 'WindowBase'),
     'EventTarget get':
       Conversion('_convertNativeToDart_EventTarget', 'dynamic',
                  'EventTarget'),
     'EventTarget set':
       Conversion('_convertDartToNative_EventTarget', 'EventTarget',
                  'dynamic'),
 
+    'WebGLContextAttributes get':
+      Conversion('convertNativeToDart_ContextAttributes', 'dynamic',
+                 'ContextAttributes'),
+
     'ImageData get':
       Conversion('convertNativeToDart_ImageData', 'dynamic', 'ImageData'),
     'ImageData set':
       Conversion('convertDartToNative_ImageData', 'ImageData', 'dynamic'),
 
     'Dictionary get':
       Conversion('convertNativeToDart_Dictionary', 'dynamic', 'Map'),
     'Dictionary set':
       Conversion('convertDartToNative_Dictionary', 'Map', 'dynamic'),
 
@@ skipping 702 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)