Added vulcanize under third_party/npm_modules

node_modules/vulcanize/test/html/imports/simple-style.css

 /*
+@license
 Copyright (c) 2014 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
 */
-
-:host {
-  position: absolute;
-  overflow: auto;
-  background-color: #fff;
-}
+:host([type="platform"]) { background-color: red; }
+:host([type="core"]) { background-color: red; }
+:host([type="elements"]) { background-color: red; }
+polyfill-next-selector { content: ':host header'; }
+polyfill-next-selector { content: 'I WIN'; }