Add PolymerElements/paper-item and run reproduce.sh

third_party/polymer/v0_8/components-chromium/paper-item/paper-item-shared.css

-<!--
+/*
     @license
-    Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+    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
--->
-<script src="../web-animations-js/web-animations-next-lite.min.js"></script>
+*/
+
+:host {
+  display: block;
+  min-height: 48px;
+  padding: 0px 16px;
+}
+
+:host > ::content > *:not(:first-child):not(:last-child) {
+  margin-right: 16px;
+}