Add support for native bindings generation to dartgenerator.py.

client/dom/templates/dom/native/dart_implementation.darttemplate

Index: client/dom/templates/dom/native/dart_implementation.darttemplate
diff --git a/client/dom/templates/dom/native/dart_implementation.darttemplate b/client/dom/templates/dom/native/dart_implementation.darttemplate
new file mode 100644
index 0000000000000000000000000000000000000000..62a255d3aa76870c4dc3865c7b97f4f14b1473d7
--- /dev/null
+++ b/client/dom/templates/dom/native/dart_implementation.darttemplate
@@ -0,0 +1,12 @@
+// 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.
+
+// WARNING: Do not edit - generated code.
+
+class $CLASS extends $BASE implements $INTERFACE {
+  static $CLASS _create$CLASS() => new $CLASS._create$CLASS();
+  $CLASS._create$CLASS();
+  String get typeName() => "$INTERFACE";
+$MEMBERS
+}