title: onPageFinished equivalant in custom chrome tab to get url
body: <p>I am implementing Custom chrome tab in one of my app . 
  I have initiated Custom chrome tab intent with 
  startActivityforResult.
  When user back press from action bar or bottom menu activity's onActivityResult gets called  but intent is null.
  I want to receive url as we do in  onPageFinished(view, String url) in case of WebViewClient.</p>
  
  <p>Thanks in advance .</p>
  
  <p>Thanks in advance</p>