installing new brain lobe in your skull

Sooner or later we will be able to graft more brain on our brain.  I can image that we would start small by cutting out a coin-sized hole of skull and attaching a little hemishere lobe with a porous plastic dome that allows bone growth into it so that you get a little bump on your head there.  Maybe you could have a Wi-fi in it and Google stuff in your head.

As if Google didn't know enough of everyone's private lives.