An expansion of St. Jude Medical’s corporate headquarters in Little Canada could bring with it 350 new jobs, according to a financial report published this week. St. Jude Medical broke ground last year on a new 175,000-square-foot building that will have room for 600 workers in office jobs, research and development, and manufacturing. While the company has not specified how many of these workers will be new hires, bond-rating agency Moody’s Investors Service put the number this week at 350. The report didn’t say over what period of time the jobs would be added.