A few API changes:

tools/dom/scripts/systemnative.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 systems to generate
 native binding from the IDL database."""
 
 import emitter
 import os
@@ skipping 1186 matching lines @@
     e.Emit('#ifndef DartWebkitClassIds_h\n');
     e.Emit('#define DartWebkitClassIds_h\n');
     e.Emit('\n');
     e.Emit('namespace WebCore {\n');
     e.Emit('\n');
     e.Emit('enum {\n');
     e.Emit('    _HistoryCrossFrameClassId = 0,\n');
     e.Emit('    _LocationCrossFrameClassId,\n');
     e.Emit('    _DOMWindowCrossFrameClassId,\n');
     e.Emit('    _DateTimeClassId,\n');
+    e.Emit('    _JsObjectClassId,\n');
+    e.Emit('    _JsFunctionClassId,\n');
     e.Emit('    // New types that are not auto-generated should be added here.\n');
     e.Emit('\n');
     for interface in database.GetInterfaces():
       interface_name = interface.id
       e.Emit('    %sClassId,\n' % interface_name)
     e.Emit('    NumWebkitClassIds\n');
     e.Emit('};\n');
 
     e.Emit('typedef struct {\n');
     e.Emit('    const char* class_name;\n');
@@ skipping 23 matching lines @@
     e.Emit('\n');
     e.Emit('#include "bindings/dart/DartLibraryIds.h"\n');
     e.Emit('\n');
     e.Emit('namespace WebCore {\n');
     e.Emit('\n');
     e.Emit("_DartWebkitClassInfo DartWebkitClassInfo = {\n");
     e.Emit('    { "_HistoryCrossFrame", DartHtmlLibraryId, -1, false, false, false },\n');
     e.Emit('    { "_LocationCrossFrame", DartHtmlLibraryId, -1, false, false, false },\n');
     e.Emit('    { "_DOMWindowCrossFrame", DartHtmlLibraryId, -1, false, false, true },\n');
     e.Emit('    { "DateTime", DartCoreLibraryId, -1, false, false, false },\n');
+    e.Emit('    { "JsObject", DartJsLibraryId, -1, false, false, false },\n');
+    e.Emit('    { "JsFunction", DartJsLibraryId, _JsObjectClassId, false, false, false },\n');
     e.Emit('    // New types that are not auto-generated should be added here.\n');
     e.Emit('\n');
     is_node_test = lambda interface: interface.id == 'Node'
     is_active_test = lambda interface: 'ActiveDOMObject' in interface.ext_attrs
     is_event_target_test = lambda interface: 'EventTarget' in interface.ext_attrs
     def TypeCheckHelper(test):
       return 'true' if any(map(test, database.Hierarchy(interface))) else 'false'
     for interface in database.GetInterfaces():
       e.Emit("    {")
       type_info = type_registry.TypeInfo(interface.id)
@@ skipping 13 matching lines @@
     e.Emit('\n');
     e.Emit('} // namespace WebCore\n');
     self._emitters.Flush()
 
 def _IsOptionalStringArgumentInInitEventMethod(interface, operation, argument):
   return (
       interface.id.endswith('Event') and
       operation.id.startswith('init') and
       argument.ext_attrs.get('Default') == 'Undefined' and
       argument.type.id == 'DOMString')