Well, I have noticed that Chinese Google maps is really incomplete and inaccurate. Apparently this is due to Chinese law restricting mapping.
Getting accurate maps of China would require special authorization from the Chinese government. If they become partners with Didi Chuxing, maybe they can get access to the accurate maps that they must have in order to operate there. And maybe that could pave the way toward bringing a self-driving car to China. I don't know, just spitballing.