The line forms for dinner outside of Killen’s Barbecue in Pearland. (Photo ©Daniel Goncalves/fotobia.com) Killen’s Barbecue in Pearland will soon begin accepting reservations for its dinner service, owner Ronnie Killen said. This is a major break from common practice at Texas’ best barbecue joints. None of them take reservations and many of them stop serving when they sell out of meat, often long before dinner time. Diners will be seated at tables and then order from waiters, Killen said. Steaks, including chicken-fried ribeyes, and other fare will also be available. The Posse talked to Killen, who also operates several other…