Add "Keep chrome running in background" preference.

chrome/browser/resources/options/advanced_options.js

 // Copyright (c) 2011 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;
 
   //
   // AdvancedOptions class
@@ skipping 95 matching lines @@
             [String($('sslCheckRevocation').checked)]);
       };
       $('sslUseSSL3').onclick = function(event) {
         chrome.send('useSSL3CheckboxAction',
             [String($('sslUseSSL3').checked)]);
       };
       $('sslUseTLS1').onclick = function(event) {
         chrome.send('useTLS1CheckboxAction',
             [String($('sslUseTLS1').checked)]);
       };
+      if ($('backgroundModeCheckbox')) {
+        $('backgroundModeCheckbox').onclick = function(event) {
+          chrome.send('backgroundModeAction',
+              [String($('backgroundModeCheckbox').checked)]);
+        };
+      }
 
       // 'cloudPrintProxyEnabled' is true for Chrome branded builds on
       // certain platforms, or could be enabled by a lab.
       if (!cr.isChromeOS) {
         $('cloudPrintProxySetupButton').onclick = function(event) {
           if ($('cloudPrintProxyManageButton').style.display == 'none') {
             // Disable the button, set it's text to the intermediate state.
             $('cloudPrintProxySetupButton').textContent =
               localStrings.getString('cloudPrintProxyEnablingButton');
             $('cloudPrintProxySetupButton').disabled = true;
@@ skipping 103 matching lines @@
     $('sslUseSSL3').checked = checked;
     $('sslUseSSL3').disabled = disabled;
   };
 
   // Set the checked state for the sslUseTLS1 checkbox.
   AdvancedOptions.SetUseTLS1CheckboxState = function(checked, disabled) {
     $('sslUseTLS1').checked = checked;
     $('sslUseTLS1').disabled = disabled;
   };
 
+  // Set the checked state for the backgroundModeCheckbox element.
+  AdvancedOptions.SetBackgroundModeCheckboxState = function(checked) {
+    $('backgroundModeCheckbox').checked = checked;
+  };
+
   // Set the Cloud Print proxy UI to enabled, disabled, or processing.
   AdvancedOptions.SetupCloudPrintProxySection = function(
         disabled, label, allowed) {
     if (!cr.isChromeOS) {
       $('cloudPrintProxyLabel').textContent = label;
       if (disabled || !allowed) {
         $('cloudPrintProxySetupButton').textContent =
           localStrings.getString('cloudPrintProxyDisabledButton');
         $('cloudPrintProxyManageButton').style.display = 'none';
       } else {
@@ skipping 12 matching lines @@
         proxySectionElm.parentNode.removeChild(proxySectionElm);
     }
   };
 
   // Export
   return {
     AdvancedOptions: AdvancedOptions
   };
 
 });