MD Settings: add test for managed actionability of people section

chrome/browser/resources/settings/people_page/people_page.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-checkbox/paper-checkbox.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="/controls/settings_checkbox.html">
 <link rel="import" href="/people_page/sync_page.html">
 <link rel="import" href="/people_page/profile_info_browser_proxy.html">
@@ skipping 108 matching lines @@
             <div class="middle"
                 inner-h-t-m-l="[[getDomainHtml_(syncStatus.domain)]]">
             </div>
           </div>
         </template>
 </if>
 
         <template is="dom-if"
             if="[[isAdvancedSyncSettingsVisible_(syncStatus)]]">
           <div class="settings-box two-line" on-tap="onSyncTap_"
-              actionable$="[[!syncStatus.managed]]">
+              id="customize-sync" actionable$="[[!syncStatus.managed]]">
             <div class="icon-container">
               <iron-icon id="sync-icon" icon$="[[getSyncIcon_(syncStatus)]]">
               </iron-icon>
             </div>
             <div class="middle">
               <div>$i18n{sync}</div>
               <div class="secondary" hidden="[[syncStatus.hasError]]">
                 [[syncStatus.statusText]]
               </div>
               <div class="secondary sync-error"
@@ skipping 174 matching lines @@
 
 <if expr="chromeos">
     <template is="dom-if" if="[[easyUnlockEnabled_]]">
       <easy-unlock-turn-off-dialog id="easyUnlockTurnOffDialog">
       </easy-unlock-turn-off-dialog>
     </template>
 </if>
   </template>
   <script src="people_page.js"></script>
 </dom-module>