Added base template for config ui.

appengine/config_service/ui/bower_components/polymer/lib/utils/boot.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';
+
+  const userPolymer = window.Polymer;
+
+  /**
+   * @namespace Polymer
+   * @summary Polymer is a lightweight library built on top of the web
+   * standards-based Web Components API's, and makes it easy to build your
+   * own custom HTML elements.
+   * @param {Object} info Prototype for the custom element. It must contain
+   * an `is` property to specify the element name. Other properties populate
+   * the element prototype. The `properties`, `observers`, `hostAttributes`,
+   * and `listeners` properties are processed to create element features.
+   * @return {Object} Returns a custom element class for the given provided
+   * prototype `info` object. The name of the element if given by `info.is`.
+   */
+  window.Polymer = function(info) {
+    return window.Polymer._polymerFn(info);
+  }
+
+  // support user settings on the Polymer object
+  if (userPolymer) {
+    Object.assign(Polymer, userPolymer);
+  }
+
+  // To be plugged by legacy implementation if loaded
+  /**
+   * @param {Object} info Prototype for the custom element. It must contain
+   * an `is` property to specify the element name. Other properties populate
+   * the element prototype. The `properties`, `observers`, `hostAttributes`,
+   * and `listeners` properties are processed to create element features.
+   */
+  window.Polymer._polymerFn = function(info) { // eslint-disable-line no-unused-vars
+    throw new Error('Load polymer.html to use the Polymer() function.');
+  }
+  window.Polymer.version = '2.0.1';
+
+  /* eslint-disable no-unused-vars */
+  /*
+  When using Closure Compiler, JSCompiler_renameProperty(property, object) is replaced by the munged name for object[property]
+  We cannot alias this function, so we have to use a small shim that has the same behavior when not compiling.
+  */
+  window.JSCompiler_renameProperty = function(prop, obj) {
+    return prop;
+  }
+  /* eslint-enable */
+
+})();
+</script>