Harris was on the Chiefs practice squad last season (and the year before that). He had quite a bit of time with the team in training camp a couple years ago when Brian Waters was down but hasn't seen any regular season time.
It'll be interesting to see what happens to Harris, and the guards specifically.
The Chiefs have Ryan Lilja and Jon Asamoah at guard while Rodney Hudson backed up last year. Hudson could be moving on to replace Casey Wiegmann as the center of the future so there could be a depth spot open on the interior offensive line.