Detect if App is launched from Add to Home icon

Question

I am using Cubic to implement 'Add to home' functionality. What I want to know is how can I detect if my application is launched from the icon created by 'add to home' or from any browser.

I want this check basically on iPad. Usually there are 3 ways my users access my app on iPad:

1. Shortcut on home (created by add to home)
2. Google Chrome
3. Safari

I could detect the 2nd and 3rd. But I couldn't detect the 1st one.

This is how I check if the user is using iPad:

var isiPad = navigator.userAgent.match(/iPad/i) != null;
if(isiPad){
  /* do something */
}

This is how I check if the user is using Google Chrome on iPad:

if(navigator.userAgent.match('CriOS')){
  /* do something */
}

Thanks in advance for any help.