By Zach Koons The 27-year-old becomes the fourth signal-caller on Cleveland’s roster. View the original article to see embedded media. The Browns have reportedly added another quarterback to the roster ahead of the summer, agreeing to terms with veteran Joshua Dobbs on a one-year deal, according to Dobbs’ agent Mike McCartney. Dobbs, 27, becomes the fourth quarterback on Cleveland’s roster, joining Deshaun Watson, Jacoby Brissett and Baker Mayfield on the team’s depth chart. Mayfield has requested a trade from the Browns and is expected to be moved before next season. The Steelers selected Dob…