* Thomson Reuters launches U.S. domestic news service * Service is part of "multimillion" dollar investment * Signs Tribune Co as first Reuters America client NEW YORK, Dec 13 (Reuters) - Thomson Reuters Corp (TRI.TO) (TRI.N) has launched a news service for U.S. publishers and broadcasters in a bid to win business from the Associated Press and CNN. The new service, Reuters America, provides text stories, photos and video by Reuters journalists for newspapers, television stations and online publishers. Newspaper publisher and broadcaster Tribune Co (TRBCQ.PK) is its first customer. As part of the service, Reuters America also will offer...