DALLAS The San Francisco Giants are done building their 2012roster. That was the easy part. Now comes their toughest task: Reaching long-term contracts withTim Lincecum and Matt Cain, the two load-bearing pillars in theirNeoclassic rotation. There was never an illusion of ease with Lincecum, a speciallyaccomplished ace who is expected to set salary records in each ofhis final two arbitration years.