config_service: add a popup for icons and make cards more compact.

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">
 <link rel="import" href="../../bower_components/paper-spinner/paper-spinner.html">
 <link rel="import" href="../../bower_components/polymer/polymer.html">
 <link rel="import" href="../../bower_components/iron-icons/maps-icons.html">
+<link rel="import" href="../../bower_components/paper-tooltip/paper-tooltip.html">
 
 <dom-module id="config-set">
   <template>
     <style>
       .spinner {
         text-align: center;
       }
 
       .category {
         font-size: 100%;
@@ skipping 66 matching lines @@
             </template>
             <template is="dom-if" if="[[_not(lastImportAttempt.success)]]">
               <iron-icon id="invalid" icon="icons:warning" class="paper-red"></iron-icon>
             </template>
           </template>
           <template is="dom-if" if="[[_not(lastImportAttempt)]]">
             <iron-icon icon="icons:help" class="paper-grey"></iron-icon>
           </template>
         </template>
         <template is="dom-if" if="[[auth_headers]]">
-          <iron-icon icon="icons:refresh" on-tap="_forceRefresh"></iron-icon>
+          <paper-icon-button id="force-refresh"
+                             icon="icons:refresh"
+                             on-tap="_forceRefresh">
+          </paper-icon-button>
+          <paper-tooltip for="force-refresh" offset="0">
+            Force the config refresh.
+          </paper-tooltip>
         </template>
       </div>
       <div class="category">
         <p>[[_formatCategory(category)]]</p>
         <template is="dom-if" if="[[_not(isLoading)]]">
           <template is="dom-if" if="[[lastImportAttempt]]">
             <template is="dom-if" if="[[_not(lastImportAttempt.success)]]">
               Last import attempt failed: [[lastImportAttempt.message]]
             </template>
+            <template is="dom-if" if="[[lastImportAttempt.success]]">
+              Last import succeeded.
+            </template>
           </template>
           <template is="dom-if" if="[[_not(lastImportAttempt)]]">
             Last import attempt info not available.
           </template>
         </template>
         <p id="refreshStatus">[[refreshMessage]]</p>
       </div>      
     </div>
     <template is="dom-if" if="[[isRefreshing]]">
       <div class="spinner">
@@ skipping 114 matching lines @@
         this.isLoading = false;
       },
 
       _onRefreshError: function() {
         this.isRefreshing = false;
         this.refreshMessage = "Error: Files could not be refreshed.";
       }
     });
   </script>
 </dom-module>