SAN FRANCISCO — There’s never been a Major League manager with less experience than Tony Vitello, but the Giants are on the verge of adding another coach to his staff who will fill some of the gaps as he makes the transition from Tennessee to the big leagues.During an appearance on KNBR on Thursday morning, general manager Zack Minasian confirmed a USA Today report that the organization is finalizing a deal with longtime coach and manager Ron Washington, giving Vitello another experienced voice, and giving the Giants one of the best infield coaches around. Washington, 73, was most recently the manager in Anaheim, where Minasian’s brother is the general manager. He has 10 years of big league managing experience with the Angels and Texas Rangers and has been a coach for the Athletics and Atlanta Braves. The Giants still are in the process of finalizing exact roles for their incoming coaches, and Minasian said it’s possible Washington gets in the mix as third base coach. But at the very least, he will coach up the infielders, and few have ever been better at that. With Washington and Ron Wotus in the organization, the Giants will have two of the...