Update "Predict network actions" UI setting.

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;
   var HotwordSearchSettingIndicator = options.HotwordSearchSettingIndicator;
+  var NetworkPredictionOptions = {
+    ALWAYS: 0,
+    WIFI_ONLY: 1,
+    NEVER: 2,
+    UNSET: 3,
+    DEFAULT: 1
+  };
 
   //
   // BrowserOptions class
   // Encapsulated handling of browser options page.
   //
   function BrowserOptions() {
     Page.call(this, 'settings', loadTimeData.getString('settingsTitle'),
               'settings');
   }
 
@@ skipping 348 matching lines @@
         var updateMetricsRestartButton = function() {
           $('metrics-reporting-reset-restart').hidden =
               loadTimeData.getBoolean('metricsReportingEnabledAtStart') ==
                   $('metricsReportingEnabled').checked;
         };
         Preferences.getInstance().addEventListener(
             $('metricsReportingEnabled').getAttribute('pref'),
             updateMetricsRestartButton);
         updateMetricsRestartButton();
       }
+      $('networkPredictionOptions').onchange = function(event) {
+        var value = (event.target.checked ?
+            NetworkPredictionOptions.WIFI_ONLY :
+            NetworkPredictionOptions.NEVER);
+        var metric = event.target.metric;
+        Preferences.setIntegerPref(
+            'net.network_prediction_options',
+            value,
+            true,
+            metric);
+      };
 
       // Bluetooth (CrOS only).
       if (cr.isChromeOS) {
         options.system.bluetooth.BluetoothDeviceList.decorate(
             $('bluetooth-paired-devices-list'));
 
         $('bluetooth-add-device').onclick =
             this.handleAddBluetoothDevice_.bind(this);
 
         $('enable-bluetooth').onchange = function(event) {
@@ skipping 1088 matching lines @@
      * @private
      */
     setMetricsReportingSettingVisibility_: function(visible) {
       if (visible)
         $('metricsReportingSetting').style.display = 'block';
       else
         $('metricsReportingSetting').style.display = 'none';
     },
 
     /**
+     * Set network prediction checkbox value.
+     *
+     * @param {Object} pref Information about network prediction options.
+     * @param {number} pref.value The value of network prediction options.
+     * @param {boolean} pref.disabled If the pref is not user modifiable.
+     * @private
+     */
+    setNetworkPredictionValue_: function(pref) {
+      var checkbox = $('networkPredictionOptions');
+      checkbox.disabled = pref.disabled;
+      if (pref.value == NetworkPredictionOptions.UNSET) {
+        checkbox.checked = (NetworkPredictionOptions.DEFAULT !=
+            NetworkPredictionOptions.NEVER);
+      } else {
+        checkbox.checked = (pref.value != NetworkPredictionOptions.NEVER);
+      }
+    },
+
+    /**
      * Set the font size selected item. This item actually reflects two
      * preferences: the default font size and the default fixed font size.
      *
      * @param {Object} pref Information about the font size preferences.
      * @param {number} pref.value The value of the default font size pref.
      * @param {boolean} pref.disabled True if either pref not user modifiable.
      * @param {string} pref.controlledBy The source of the pref value(s) if
      *     either pref is currently not controlled by the user.
      * @private
      */
@@ skipping 362 matching lines @@
     'notifyInitializationComplete',
     'removeBluetoothDevice',
     'scrollToSection',
     'setAccountPictureManaged',
     'setWallpaperManaged',
     'setAutoOpenFileTypesDisplayed',
     'setBluetoothState',
     'setCanSetTime',
     'setFontSize',
     'setNativeThemeButtonEnabled',
+    'setNetworkPredictionValue',
     'setHighContrastCheckboxState',
     'setMetricsReportingCheckboxState',
     'setMetricsReportingSettingVisibility',
     'setProfilesInfo',
     'setSpokenFeedbackCheckboxState',
     'setThemesResetButtonEnabled',
     'setVirtualKeyboardCheckboxState',
     'setupPageZoomSelector',
     'setupProxySettingsButton',
     'showBluetoothSettings',
@@ skipping 30 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });