Lions trading up for Watkins?

Matthew Stafford already has Calvin Johnson and Golden Tate to throw to next season, but the Detroit Lions are still looking to give Stafford another big-time target. None would be bigger at this point than Clemson standout Sammy Watkins, the top-rated pass-catcher in the draft, but what would it take for the Lions at No. 10 to trade up for big-play receiver?