Texas earned the regular season Big 12 championship and the top seed in the conference tournament this year. And as head coach Mike White considers things, he figures last season and the postseason run from the Longhorns had a lot to do with it. The Longhorns brought back plenty of young players from that squad, and he found the postseason experience paid off this year, White said on the ESPN2 broadcast of the title game. However, Oklahoma had pulled out to a lead over Texas early in the matchup. “Well I think it all started last year,” White said. “We went deep into the postseason and got a l…