Added base template for config ui.

appengine/config_service/ui/bower_components/polymer/lib/utils/unresolved.html

+<!--
+@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
+-->
+<script>
+(function() {
+  'use strict';
+
+  // unresolved
+
+  function resolve() {
+    document.body.removeAttribute('unresolved');
+  }
+
+  if (window.WebComponents) {
+    window.addEventListener('WebComponentsReady', resolve);
+  } else {
+    if (document.readyState === 'interactive' || document.readyState === 'complete') {
+      resolve();
+    } else {
+      window.addEventListener('DOMContentLoaded', resolve);
+    }
+  }
+
+})();
+</script>