Strange Design Choices

So when you go to the GMail login page, your password is filled in for you and you can start typing your username. BUT: As soon as you hit tab or enter, the password is erased (meaning that at least you can't log in without actually typing your password). But what is the point of showing you what your password looks like filled in? "Oooh, that's a lot of dots, I must be using the long password here!"