Add support for native bindings generation to dartgenerator.py.

client/dom/src/native_DOMWrapperBase.dart

Index: client/dom/src/native_DOMWrapperBase.dart
diff --git a/client/dom/src/native_DOMWrapperBase.dart b/client/dom/src/native_DOMWrapperBase.dart
new file mode 100644
index 0000000000000000000000000000000000000000..db1f3e7e6e8d0788290e594bb7128ff5a22cc595
--- /dev/null
+++ b/client/dom/src/native_DOMWrapperBase.dart
@@ -0,0 +1,7 @@
+// 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.
+
+class DOMWrapperBase extends NativeFieldWrapperClass2 implements DOMType {
+  var dartObjectLocalStorage;
+}