Added base template for config ui.

appengine/config_service/ui/bower_components/polymer/lib/mixins/gesture-event-listeners.html

Index: appengine/config_service/ui/bower_components/polymer/lib/mixins/gesture-event-listeners.html
diff --git a/appengine/config_service/ui/bower_components/polymer/lib/mixins/gesture-event-listeners.html b/appengine/config_service/ui/bower_components/polymer/lib/mixins/gesture-event-listeners.html
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+<!--
+@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
+-->
+<link rel="import" href="../utils/boot.html">
+<link rel="import" href="../utils/gestures.html">
+
+<script>
+(function() {
+
+  'use strict';
+
+  const gestures = Polymer.Gestures;
+
+  /**
+   * Element class mixin that provides API for adding Polymer's cross-platform
+   * gesture events to nodes.
+   *
+   * The API is designed to be compatible with override points implemented
+   * in `Polymer.TemplateStamp` such that declarative event listeners in
+   * templates will support gesture events when this mixin is applied along with
+   * `Polymer.TemplateStamp`.
+   *
+   * @polymerMixin
+   * @memberof Polymer
+   * @summary Element class mixin that provides API for adding Polymer's cross-platform
+   * gesture events to nodes
+   */
+  Polymer.GestureEventListeners = Polymer.dedupingMixin(superClass => {
+
+    /**
+     * @polymerMixinClass
+     * @implements {Polymer_GestureEventListeners}
+     */
+    class GestureEventListeners extends superClass {
+
+      _addEventListenerToNode(node, eventName, handler) {
+        if (!gestures.addListener(node, eventName, handler)) {
+          super._addEventListenerToNode(node, eventName, handler);
+        }
+      }
+
+      _removeEventListenerFromNode(node, eventName, handler) {
+        if (!gestures.removeListener(node, eventName, handler)) {
+          super._removeEventListenerFromNode(node, eventName, handler);
+        }
+      }
+
+    }
+
+    return GestureEventListeners;
+
+  });
+
+})();
+</script>