Watch out, Google Maps for Android, it looks like Apple's iOS Maps may soon be entering the building -- when it comes to indoor GPS tracking anyway. The Wall Street Journal's Digits blog is reporting that Apple has confirmed it purchased WiFiSlam, a startup that specializes in WiFi-assisted indoor-GPS functionality for phone apps. Interestingly, Digits notes that the company was founded by a few ex-Googlers a couple of years back and that one of its investors has included a Google employee. Further, a quick
