By Bret Kenwell Speculation about a tie-up between Roku and Netflix is swirling. Here’s how to trade the stocks right now. Roku (ROKU) – Get Roku Inc. Report shares are more than 12% higher on June 8, while Netflix (NFLX) – Get Netflix Inc. Report is hitting a session high, too, up about 3.5%. The rumor on Wall Street is a potential takeover of Roku by Netflix. In premarket trading Roku shares were modestly higher while Netflix was lower. With both now trading higher, it may suggest that investors — and the market — approve of such a deal, should one be in the works. Netflix has the robust sub…