In two short years, Robert Johnson had accumulated quite the résumé as track and field coach at Oregon. The Ducks won five national titles between the fall of 2012 and the spring of 2014, in cross country, indoor track and field and outdoor track and field. On Saturday, Johnson’s résumé gained an item that moves to the top of the list. One year after the Men of Oregon ended a 30-year title drought at the NCAA Outdoor Track & Field Championships by winning the championship, the women did the same Saturday at Hayward Field. That gave the Ducks a sweep of the outdoor team titles in 2015, and for the first time in school history. “That’s the crown jewel,” Johnson said, a few minutes after being doused with the contents of an ice bucket — for the second time in as many days. The Oregon women won with 59-points, nine more than runner-up Kentucky with 50. Oregon’s men clinched their title on Friday by scoring 85-points to Florida’s 56 and Arkansas’ 53.