Added vulcanize under third_party/npm_modules

node_modules/vulcanize/example/import-test.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 {
-  display: block;
-  position: relative;
-  border-right: 1px solid silver;
-}
-
-core-header-panel {
-  position: absolute;
-  top: 0;
-  left: 0;
-  height: 100%;
-  width: 100%;
-}
-
-core-toolbar {
-  background-color: #eeeeee;
-}
+: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'; }