Add property to CssStyleDeclaration to detect if a CSS value is available.

tools/dom/scripts/dartgenerator.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 generates Dart APIs from the IDL database."""
 
 import emitter
 import idlnode
 import logging
@@ skipping 39 matching lines @@
     if database.HasEnum(stripped_type_name):
       return True
 
     dart_template_match = self._dart_templates_re.match(type_name)
     if dart_template_match:
       # Dart templates
       parent_type_name = type_name[0 : dart_template_match.start(1) - 1]
       sub_type_name = dart_template_match.group(1)
       return (self._IsCompoundType(database, parent_type_name) and
               self._IsCompoundType(database, sub_type_name))
+    
+    if type_name == 'union':
+      return True
+
     return False
 
   def _IsDartType(self, type_name):
     return '.' in type_name
 
   def LoadAuxiliary(self, auxiliary_dir):
     def Visitor(_, dirname, names):
       for name in names:
         if name.endswith('.dart'):
           name = name[0:-5]  # strip off ".dart"
@@ skipping 157 matching lines @@
   def AddMissingArguments(self, database):
     ARG = idlnode.IDLArgument([('Type', ('ScopedName', 'object')), ('Id', 'arg')])
     for interface in database.GetInterfaces():
       for operation in interface.operations:
         call_with = (operation.ext_attrs.get('CallWith', '').split('|') +
                      operation.ext_attrs.get('ConstructorCallWith', '').split('|') +
                      operation.ext_attrs.get('CallWith', '').split('&') +
                      operation.ext_attrs.get('ConstructorCallWith', '').split('&'))
         if 'ScriptArguments' in call_with:
           operation.arguments.append(ARG)