Google tests Site Authentication Feature

I found google testing a new feature a new tab named Site Authentication in the AdSense publisher console.

I don't know if you guys see that tab in your consoles but when i go to the link it just shows me site authentication and nothing else.

Now you maybe thinking what does site authentication do in AdSense?

It allows you to submit a username and password, so that they can access pages that are secured by a user/pass requirement.

This can be helpful so you can allow google to enter your site and blocking the guest if you have features to block guest from seeing your site.

Update: DaveN has a screen cap at his blog, so check it out.