config_service: add last import validation and tests

appengine/config_service/ui/src/config-ui/config-ui.html

 <!--
   Copyright 2017 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 -->
 
 <link rel="import" href="../../bower_components/polymer/polymer.html">
 <link rel="import" href="../../bower_components/app-layout/app-layout.html">
 <link rel="import" href="../../bower_components/paper-search/paper-search-bar.html">
 <link rel="import" href="../../bower_components/app-route/app-location.html">
@@ skipping 51 matching lines @@
 
     <app-route  route="{{route}}" 
                 pattern="/" 
                 active="{{frontPageActive}}"></app-route>
 
     <div hidden$="[[!frontPageActive]]">
       <front-page></front-page>
     </div>
 
     <div hidden$="[[!serviceActive]]">
-      <config-set category="services" 
-                  config-set-name="{{serviceData.serviceName}}" 
-                  route="{{serviceTail}}"></config-set>
-    </div>      
+      <config-set category="services"
+                  name="{{serviceData.serviceName}}"
+                  route="{{serviceTail}}"
+                  front-page-is-active="{{frontPageActive}}"></config-set>
+    </div>
 
     <div hidden$="[[!projectActive]]">
-      <config-set category="projects"  
-                  config-set-name="{{projectData.projectName}}" 
-                  route="{{projectTail}}"></config-set>
-    </div>        
+      <config-set category="projects"
+                  name="{{projectData.projectName}}"
+                  route="{{projectTail}}"
+                  front-page-is-active="{{frontPageActive}}"></config-set>
+    </div>
 
   </template>
 
   <script>
     Polymer({
       is: 'config-ui',
       
       ready: function() {
         this.async(function() {
           // If the path is blank, redirect to /
           if (!this.route.path) {
             this.set('route.path', '/');
           }
         });
       },
 
     });
   </script>
 </dom-module>