Make DOMType the root of DOM implementation types.

client/dom/src/frog_DOMType.dart

Index: client/dom/src/frog_DOMType.dart
diff --git a/client/dom/src/frog_DOMType.dart b/client/dom/src/frog_DOMType.dart
new file mode 100644
index 0000000000000000000000000000000000000000..695214ff248ed0ec1422a3d3a38dbd479c85113e
--- /dev/null
+++ b/client/dom/src/frog_DOMType.dart
@@ -0,0 +1,10 @@
+// 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.
+
+interface DOMType {
+  // TODO(vsm): Remove if/when Dart supports OLS for all objects.
+  var dartObjectLocalStorage;
+
+  String get typeName();
+}