Hotword Audio Verification app: control the hotword settings

chrome/browser/resources/options/browser_options.html

 <div id="settings" class="page" hidden>
   <header>
     <h1 i18n-content="settingsTitle"></h1>
   </header>
   <include src="reset_profile_settings_banner.html">
   <include src="automatic_settings_reset_banner.html">
 <if expr="chromeos">
   <include src="secondary_user_banner.html">
   <section>
     <div id="network-section-header" class="section-header">
@@ skipping 141 matching lines @@
           </button>
         </div>
       </div>
   </section>
   <section>
     <h3 id="voice-section-title" i18n-content="sectionTitleVoice" hidden></h3>
     <div id="voice-section-content">
       <div id="hotword-always-on-search" hidden>
         <div class="checkbox controlled-setting-with-label">
           <label>
-            <input pref="hotword.always_on_search_enabled" type="checkbox">
+            <input id="hotword-always-on-search-checkbox"
+                pref="hotword.always_on_search_enabled" type="checkbox">
             <span i18n-content="hotwordAlwaysOnSearchEnable"></span>
           </label>
         </div>
       </div>
       <div id="audio-logging" hidden>
         <div class="checkbox controlled-setting-with-label">
           <label>
             <input pref="hotword.audio_logging_enabled" type="checkbox">
             <span i18n-content="hotwordAudioHistoryEnable"></span>
           </label>
@@ skipping 756 matching lines @@
   </div>  <!-- advanced-settings -->
   <footer>
     <button id="advanced-settings-expander" class="link-button"
         i18n-content="showAdvancedSettings">
     </button>
     <button id="version-button" class="link-button" hidden
         i18n-content="browserVersion">
     </button>
   </footer>
 </div>