Fox CEO Lachlan Murdoch is making a major acquisition that will boost his company's streaming presence. Bloomberg/Getty Images Fox is pushing further into free, ad-supported streaming by buying Roku. Acquiring Roku's free streamer will give Fox a larger TV viewership share than Netflix. Tubi and The Roku Channel have gained popularity among audiences as paid streamers get pricier. Fox mostly sat out the streaming wars, but it could soon surpass Netflix in TV viewership anyway. Buying Roku w...