Add Now setting and migration logic.

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 228 matching lines @@
       HotwordSearchSettingIndicator.decorate(
           $('hotword-search-setting-indicator'));
       HotwordSearchSettingIndicator.decorate(
           $('hotword-no-dsp-search-setting-indicator'));
       var hotwordIndicator = $('hotword-always-on-search-setting-indicator');
       HotwordSearchSettingIndicator.decorate(hotwordIndicator);
       hotwordIndicator.disabledOnErrorSection =
           $('hotword-always-on-search-checkbox');
       chrome.send('requestHotwordAvailable');
 
+      chrome.send('requestGoogleNowAvailable');
+
       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.
@@ skipping 984 matching lines @@
      * Event listener for the 'hotword always on search enabled' preference.
      * Updates the visibility of the 'retrain' link.
      * @param {Event} event The preference change event.
      * @private
      */
     onHotwordAlwaysOnChanged_: function(event) {
       this.setHotwordRetrainLinkVisible_(event.value.value);
     },
 
     /**
+     * Controls the visibility of the Now settings.
+     * @param {boolean} visible Whether to show Now settings.
+     * @private
+     */
+    setNowSectionVisible_: function(visible) {
+      $('google-now-launcher').hidden = !visible;
+    },
+
+    /**
      * Activates the Audio History section of the Settings page.
      * @param {boolean} visible Whether the audio history section is visible.
      * @param {string} labelText Text describing current audio history state.
      * @private
      */
     setAudioHistorySectionVisible_: function(visible, labelText) {
       $('audio-history').hidden = !visible;
       $('audio-history-label').textContent = labelText;
     },
 
@@ skipping 899 matching lines @@
     'setWallpaperManaged',
     'setAutoOpenFileTypesDisplayed',
     'setBatteryIcon',
     'setBatteryStatusText',
     'setBluetoothState',
     'setCanSetTime',
     'setFontSize',
     'setHotwordRetrainLinkVisible',
     'setNativeThemeButtonEnabled',
     'setNetworkPredictionValue',
+    'setNowSectionVisible',
     'setHighContrastCheckboxState',
     'setAllHotwordSectionsVisible',
     'setMetricsReportingCheckboxState',
     'setMetricsReportingSettingVisibility',
     'setProfilesInfo',
     'setSpokenFeedbackCheckboxState',
     'setThemesResetButtonEnabled',
     'setVirtualKeyboardCheckboxState',
     'setupPageZoomSelector',
     'setupProxySettingsButton',
@@ skipping 65 matching lines @@
       }
       button.textContent = loadTimeData.getString(strId);
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });