Added base template for config ui.

appengine/config_service/ui/bower_components/webcomponentsjs/externs/webcomponents.js

+/**
+ * @license
+ * Copyright (c) 2017 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
+ *
+ * @fileoverview Symbols needed to compile webcomponents
+ * @externs
+ */
+var require;
+var global;
+var ES6Promise;
+var process;
+var define;
+var module;
+var exports;
+
+var ShadyDOM;
+var WebComponents;