Support V8EnabledAtRuntime in constructors.

lib/dom/scripts/databasebuilder.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 copy
 import database
 import idlparser
 import logging
 import os
@@ skipping 565 matching lines @@
           'HTMLAudioElementConstructor',
           'HTMLImageElementConstructor',
           'HTMLOptionElementConstructor' ]:
         type = type[:-len('Constructor')]
 
       # TODO(antonm): Ideally we'd like to have pristine copy of WebKit IDLs and fetch
       # this information directly from it.  Unfortunately right now database is massaged
       # a lot so it's difficult to maintain necessary information on DOMWindow itself.
       interface = self._database.GetInterface(options.type_rename_map.get(type, type))
       if 'V8EnabledPerContext' in attr.ext_attrs:
-        interface.ext_attrs['synthesizedV8EnabledPerContext'] = attr.ext_attrs['V8EnabledPerContext']
+        interface.ext_attrs['synthesizedV8EnabledPerContext'] = \
+            attr.ext_attrs['V8EnabledPerContext']
       if 'V8EnabledAtRuntime' in attr.ext_attrs:
-        interface.ext_attrs['synthesizedV8EnabledAtRuntime'] = attr.ext_attrs['V8EnabledAtRuntime']
+        interface.ext_attrs['synthesizedV8EnabledAtRuntime'] = \
+            attr.ext_attrs['V8EnabledAtRuntime'] or attr.id