I did not find the way to do it via command line, but here is the workaround that I use, you might find it useful as well
First it only works on Windows, though I suspect similar things might be done on Mac and Linux as well.

I use Windows Scripting Host, to send key as if they were preseed from within the app.
File keys.wsf

<package>

<job id=js>

  <script language=JScript>

     var shl = WScript.CreateObject(WScript.Shell);

     var WINTITLE= Chrome

     shl.AppActivate(WINTITLE);

     WScript.sleep(500);

     shl.SendKeys (^+i);

  </script>

  </job>

</package>

If you know that your Crome window title is might help to replace WINTITLE