Linus Upson, vice president of engineering at Chrome, speaks as volunteers play Google Racer on different devices at Google I/O 2013 in San Francisco, Wednesday, May 15, 2013. (AP Photo

 

              Linus Upson, vice president of engineering at Chrome, speaks as volunteers play Google Racer on different devices at Google I/O 2013 in San Francisco, Wednesday, May 15, 2013. (AP Photo
Linus Upson, vice president of engineering at Chrome, speaks as volunteers play Google Racer on different devices at Google I/O 2013 in San Francisco, Wednesday, May 15, 2013. (AP Photo/Jeff Chiu)