Add "Keep chrome running in background" preference.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale. OS values are passed through from Python's sys.platform:
 
   win32 - Windows
   darwin - Mac
   linux2 - Linux (both Views and GTK+)
 
@@ skipping 8288 matching lines @@
       </message>
       <message name="IDS_OPTIONS_ADVANCED_SECTION_TITLE_NETWORK">
         Network
       </message>
       <message name="IDS_OPTIONS_ADVANCED_SECTION_TITLE_TRANSLATE">
         Translate
       </message>
       <message name="IDS_OPTIONS_ADVANCED_SECTION_TITLE_CLOUD_PRINT">
         <ph name="CLOUD_PRINT_NAME">Google Cloud Print</ph>
       </message>
+      <message name="IDS_OPTIONS_ADVANCED_SECTION_TITLE_BACKGROUND">
+        Background Apps
+      </message>
 
       <!-- Multiple download warning-->
       <message name="IDS_MULTI_DOWNLOAD_WARNING" desc="Warning invoked if multiple downloads are attempted without user interaction.">
         This site is attempting to download multiple files. Do you want to allow this?
       </message>
       <message name="IDS_MULTI_DOWNLOAD_WARNING_ALLOW" desc="Text on the allow button in the IDS_MULTI_DOWNLOAD_WARNING dialog">
         Allow
       </message>
       <message name="IDS_MULTI_DOWNLOAD_WARNING_DENY" desc="Text on the deny button in the IDS_MULTI_DOWNLOAD_WARNING dialog">
         Deny
@@ skipping 4043 matching lines @@
     </includes>
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>