Make DOMType the root of DOM implementation types.

client/dom/src/frog_DOMTypeJs.dart

Index: client/dom/src/frog_DOMTypeJs.dart
diff --git a/client/dom/src/frog_DOMTypeJs.dart b/client/dom/src/frog_DOMTypeJs.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8e24915d280adfa279b4c00a17639b84b4270393
--- /dev/null
+++ b/client/dom/src/frog_DOMTypeJs.dart
@@ -0,0 +1,10 @@
+// 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.
+
+class DOMTypeJs implements DOMType native '*DOMType' {
+
+  var dartObjectLocalStorage;
+
+  String get typeName() native;
+}