Call this when something suggests that a particular worker may now be
        available to start a build.

        @param worker_name: the name of the worker

def maybeStartBuildsForWorker(self, worker_name):
        """
        Call this when something suggests that a particular worker may now be
        available to start a build.

        @param worker_name: the name of the worker
        """
        builders = self.getBuildersForWorker(worker_name)
        self.brd.maybeStartBuildsOn([b.name for b in builders])