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diff --git a/catapult/third_party/polymer/components/iron-dropdown/demo/grow-height-animation.html b/catapult/third_party/polymer/components/iron-dropdown/demo/grow-height-animation.html
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+<!--
+@license
+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="../../polymer/polymer.html">
+<link rel="import" href="../../neon-animation/neon-animation-behavior.html">
+
+<script>
+  Polymer({
+    is: 'expand-animation',
+
+    behaviors: [
+      Polymer.NeonAnimationBehavior
+    ],
+
+    configure: function(config) {
+      var node = config.node;
+
+      var height = node.getBoundingClientRect().height;
+
+      this._effect = new KeyframeEffect(node, [{
+        height: (height / 2) + 'px'
+      }, {
+        height: height + 'px'
+      }], this.timingFromConfig(config));
+
+      return this._effect;
+    }
+  });
+</script>