first draft of polymer element tutorial

src/site/docs/tutorials/polymer-intro/examples/stopwatch/build.dart

Index: src/site/docs/tutorials/polymer-intro/examples/stopwatch/build.dart
diff --git a/src/site/docs/tutorials/polymer-intro/examples/stopwatch/build.dart b/src/site/docs/tutorials/polymer-intro/examples/stopwatch/build.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1715d5ecf7cc4f1e3d2fb39491312f7a0faa1fe8
--- /dev/null
+++ b/src/site/docs/tutorials/polymer-intro/examples/stopwatch/build.dart
@@ -0,0 +1,10 @@
+#!/usr/bin/env dart
+// 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.
+
+import 'package:polymer/builder.dart';
+
+void main() {
+  build(entryPoints: ['web/index.html']); // lint and optionally build
+}