Time Warner on Wednesday announced it has entered an agreement to buy a 10 percent stake in online-streaming service Hulu, in a bid to leverage its lineup of television and film content on multiple viewing platforms. With the new investment, Time Warner will join a joint venture that includes some of the nation's largest media companies, including The Walt Disney Co., 21st Century Fox and Comcast. Time Warner will provide Hulu's new live streaming service, set to launch in early 2017, with live and on-demand content.