Google's master plan for mobile is finally coming into focus.
The latest development: Andy Rubin, who has run the Android mobile operating system since 2004, even before it was acquired by Google, is stepping down. Taking over Android will be Sundar Pichai, currently the head of Google's Chrome web browser and Chrome OS project. And here's where Google shows its hand: Even as he takes on new responsibility for Google's mobile strategy, Pichai will remain in charge of Chrome.