Rupert Murdoch chased the TV Guide of the Future for years. He spent billions trying to build an on-screen map for digital television before giving up . Now his son Lachlan looks like he's making it happen by buying Roku in a $22 billion deal . On paper, Lachlan's transaction seems like the thing his dad spent much of the '90s and 2000s trying to put together: Once the deal closes, the Murdochs will own the interface that 100 million households use when they want to stream something. It's a big