Walt Disney Co.’s “Star Wars: The Force Awakens” has already become the top film of all time in North America and is set to extend its domestic earnings total through the $800 million barrier this weekend — but it’s anyone’s guess how the movie will perform in the crucial market of China. According to Variety, the uniqueness and unpredictability of China’s movie market has made it highly difficult to foresee how well the movie will fare when it opens there tomorrow, Jan. 9.