[Hotword] Sync Audio History pref every 24 hours, when opening chrome://settings and . . .

chrome/browser/resources/options/browser_options.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.exportPath('options');
 
 /**
  * @typedef {{actionLinkText: (string|undefined),
  *            childUser: (boolean|undefined),
  *            hasError: (boolean|undefined),
@@ skipping 1203 matching lines @@
      * Updates the visibility of the 'retrain' link.
      * @param {Event} event The preference change event.
      * @private
      */
     onHotwordAlwaysOnChanged_: function(event) {
       this.setHotwordRetrainLinkVisible_(event.value.value);
     },
 
     /**
      * Activates the Audio History section of the Settings page.
+     * @param {boolean} visible Whether the audio history section is visible.
      * @param {boolean} alwaysOn Whether always-on hotwording is available.
      * @param {string} labelText Text describing current audio history state.
      * @private
      */
-    showAudioHistorySection_: function(alwaysOn, labelText) {
-      $('audio-history').hidden = false;
+    setAudioHistorySectionVisible_: function(visible, alwaysOn, labelText) {
+      $('audio-history').hidden = !visible;
       $('audio-history-label').textContent = labelText;
       $('audio-history-always-on-description').hidden = !alwaysOn;
     },
 
     /**
      * Event listener for the 'homepage is NTP' preference. Updates the label
      * next to the 'Change' button.
      * @param {Event} event The preference change event.
      */
     onHomePageIsNtpChanged_: function(event) {
@@ skipping 882 matching lines @@
     'setHighContrastCheckboxState',
     'setAllHotwordSectionsVisible',
     'setMetricsReportingCheckboxState',
     'setMetricsReportingSettingVisibility',
     'setProfilesInfo',
     'setSpokenFeedbackCheckboxState',
     'setThemesResetButtonEnabled',
     'setVirtualKeyboardCheckboxState',
     'setupPageZoomSelector',
     'setupProxySettingsButton',
-    'showAudioHistorySection',
+    'setAudioHistorySectionVisible',
     'showBluetoothSettings',
     'showCreateProfileError',
     'showCreateProfileSuccess',
     'showCreateProfileWarning',
     'showHotwordAlwaysOnSection',
     'showHotwordNoDspSection',
     'showHotwordSection',
     'showMouseControls',
     'showSupervisedUserImportError',
     'showSupervisedUserImportSuccess',
@@ skipping 54 matching lines @@
       }
       button.textContent = loadTimeData.getString(strId);
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });