When "googlechrome://www.lego.com" is opened in mobile Safari, it switches to the Google Chrome iOS app to open the URL. This feature allows for scriptlets like the following one, which enables you to open the current page in the Google Chrome iOS app from mobile Safari:
(function()%7Bif(document.location.href.indexOf('http')===0)document.location.href=document.location.href.replace(/%5Ehttp/,'googlechrome');%7D)();
I'm curious, is it possible to do the reverse? I attempted "safari://www.lego.com", but it turned out to be an invalid URL. Can you create a scriptlet that switches from Google Chrome to mobile Safari to open the current page?