Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/iron-behaviors/test/test-elements.html

+<!--
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../iron-control-state.html">
+<link rel="import" href="../iron-button-state.html">
+
+<script>
+
+  Polymer({
+
+    is: 'test-control',
+
+    behaviors: [
+      Polymer.IronControlState
+    ]
+
+  });
+
+</script>
+
+<script>
+
+  Polymer({
+
+    is: 'test-button',
+
+    behaviors: [
+      Polymer.IronControlState,
+      Polymer.IronButtonState
+    ],
+
+    _buttonStateChanged: function() {
+
+    }
+
+  });
+
+</script>