Apple has hired former WGN America President Matt Chreniss to oversee a $1 billion investment in acquiring new video content, The Wall Street Journal reports. After hemming and hawing on the sidelines for years and dabbling in video projects to bolster its Apple Music product, Apple is ready to produce as many as 10 original TV shows, according to sources familiar with the matter. The $1 billion investment is about half of what HBO spent on its own…