An accountant, a lawyer and a Hollywood executive walk into a bar . . . and it’s actually just one guy: Chris Brearton. Brearton, who joined Joe Russo and Anthony Russo’s indie studio AGBO as a partner in April, has spent 30 years as an entertainment industry dealmaker from just about every angle. He didn’t set out to work in Hollywood; he fell into it while working on MGM’s business as a CPA at accounting mega-firm KPMG — a job he took because he wanted to live somewhere fun for a couple years and learn how to surf before law school. The biz had piqued his interest, though, so Brearton pursued and landed a coveted job as an entertainment lawyer at O’Melveny & Myers. He moved his sports and media practice to Latham & Watkins a decade ago,