     debounce-duration="1000"></iron-ajax>
    <span class="last-loaded-label">Loaded [[timeAgo]]</span>
    <template is="dom-if" if="[[!loading]]">
      <if-else condition="[[error]]">
        <paper-icon-button slot="t" class="error-button" error icon="warning" on-tap="refresh" title="[[computeErrorMessage(error)]]"></paper-icon-button>
        <paper-icon-button slot="f" class="submit-button" icon="refresh" on-tap="refresh"></paper-icon-button>
      </if-else>
    </template>
    <template is="dom-if"