PHOENIX — The San Francisco Giants’ infield was so thinned out by injuries Tuesday night that manager Tony Vitello had to shatter the emergency glass. Rookie outfielder Jonah Cox, who hadn’t played on the infield dirt since he was at Oral Roberts University, found himself at second base for the Giants’ final two defensive innings.Cox ranged to make a nice play, actually, and it might be the start of a new career path. He’s working with infield coach Ron Washington with an eye on turning him into a superutility player.In baseball and life, creativity is often borne out of chaos. On balance, though, the Giants would prefer to have their infield back at full strength. Even after placing third baseman Matt Chapman on the 10-day injured list Wednesday afternoon, the overall outlook was brighter than it might have appeared the previous night.Chapman has a mild abdominal strain, as Vitello termed it, and the manager said he expects Chapman will return after the minimum 10 days. That’s a prognosis that could be revised if Chapman continues to experience discomfort. Since he’d be eligible to play just two games before the All-Star break, he might be better served taking the extra time to rest a nagging injury that flared up when he made a throw on the run to first base Tuesday night.