title: How to detect incognito mode from extension background
body: <p>I have specified "incognito" as "split" in my manifest file.</p>
  
  <p><a href="http://developer.chrome.com/extensions/manifest.html#incognito" rel="noreferrer">http://developer.chrome.com/extensions/manifest.html#incognito</a></p>
  
  <p>So if the app or extension contains a background page, that will also run in the incognito process. This incognito process runs along side the regular process, but has a separate memory-only cookie store.</p>
  
  <p>So how can I detect whether the background page is running in incognito process.</p>