James Cameron’s film “Titanic” shattered box-office records in China, as it did nearly everywhere else in the world. Its impact was especially shocking in a market that was captive to a conservative, state-dominated film industry, with no ability to produce a blockbuster of its own. Mr Cameron’s ballyhooed “Avatar” broke China’s records again in 2009 and 2010, despite more than a decade of development. Now the film bureaucrats in Beijing have a chance to accomplish something that would have been unthinkable until very recently: co-producing Mr Cameron’s “Avatar” sequels.