Added base template for config ui.

appengine/config_service/ui/bower_components/webcomponentsjs/entrypoints/custom-elements-es5-adapter-index.js

Index: appengine/config_service/ui/bower_components/webcomponentsjs/entrypoints/custom-elements-es5-adapter-index.js
diff --git a/appengine/config_service/ui/bower_components/webcomponentsjs/entrypoints/custom-elements-es5-adapter-index.js b/appengine/config_service/ui/bower_components/webcomponentsjs/entrypoints/custom-elements-es5-adapter-index.js
new file mode 100644
index 0000000000000000000000000000000000000000..93c0077e3bea185ff0480325ebe99f5f780296d8
--- /dev/null
+++ b/appengine/config_service/ui/bower_components/webcomponentsjs/entrypoints/custom-elements-es5-adapter-index.js
@@ -0,0 +1,16 @@
+/**
+@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
+*/
+'use strict';
+
+/*
+ * Polyfills loaded: Custom Elements ES5 Shim
+ */
+
+import '../bower_components/custom-elements/src/native-shim.js'