config_service: changing URL manually now reloads list of files

appengine/config_service/ui/src/config-ui/config-set.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="config-file-card.html">
 <link rel="import" href="../../bower_components/iron-ajax/iron-ajax.html">
 <link rel="import" href="../../bower_components/iron-icons/iron-icons.html">
 <link rel="import" href="../../bower_components/paper-item/paper-item.html">
@@ skipping 193 matching lines @@
 
         name: {
           type: String
         },
 
         refreshMessage: {
           type: String,
           value: null
         },
 
+        route: {
+          type: Object,
+          observer: '_routeChanged'
+        },
+
         errorMessage: {
           type: String,
           value: null
         }
       },
 
       _forceRefresh: function() {
         this.refreshMessage = null;
         this.$.refreshConfigs.generateRequest();
         this.isRefreshing = true;
@@ skipping 61 matching lines @@
             this.errorMessage = "Access denied, " + this.profile.email + 
                 " is not authorized to access this config set." + 
                 " Request access or sign in as a different user.";
           }
         } else if (500 <= error && error < 600) {
           this.errorMessage = "Internal server error.";
         } else {
           this.errorMessage = "Error occured. Try again later.";
         }
         this.fire('fetchError');
+      },
+
+      _routeChanged: function() {
+        this.isLoading = true;
+        this.$.requestConfigs.generateRequest();
       }
 
     });
   </script>
 </dom-module>