Hotword Audio Verification app: control the hotword settings

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.define('options', function() {
   var OptionsPage = options.OptionsPage;
   var Page = cr.ui.pageManager.Page;
   var PageManager = cr.ui.pageManager.PageManager;
   var ArrayDataModel = cr.ui.ArrayDataModel;
   var RepeatingButton = cr.ui.RepeatingButton;
@@ skipping 202 matching lines @@
       chrome.send('requestHotwordAvailable');
 
       if ($('set-wallpaper')) {
         $('set-wallpaper').onclick = function(event) {
           chrome.send('openWallpaperManager');
           chrome.send('coreOptionsUserMetricsAction',
                       ['Options_OpenWallpaperManager']);
         };
       }
 
+      // Control the hotword-always-on pref with the Hotword Audio
+      // Verification app.
+      $('hotword-always-on-search-checkbox').customChangeHandler =
+          function(event) {
+        if (($('hotword-always-on-search-checkbox').checked)) {
+          $('hotword-always-on-search-checkbox').checked = false;

[rpetterson, 2014/09/11 20:14:17]

Does setting checked to false actually update the preference so that it's not
set? I'm not as familiar with exactly when checkboxes update the preference
based their handlers.

[kcarattini, 2014/09/12 01:02:07]

My understanding is that this function is called after the checkbox is checked
but before the pref is updated. Returning true stops the pref from being set.
See
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/res...

+          chrome.send('launchHotwordAudioVerificationApp', [Boolean(false)]);
+          return true;
+        } else {
+          return false;
+        }
+      };
+
       $('themes-gallery').onclick = function(event) {
         window.open(loadTimeData.getString('themesGalleryURL'));
         chrome.send('coreOptionsUserMetricsAction',
                     ['Options_ThemesGallery']);
       };
       $('themes-reset').onclick = function(event) {
         chrome.send('themesReset');
       };
 
       if (loadTimeData.getBoolean('profileIsSupervised')) {
@@ skipping 1741 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });