That's not Google's choice. Sun and Oracle are the ones refusing to allow the Java trademark to be used by an open-source implementation for a mobile platform.
Google quite intentionally steered away from any certified or branded Java because they wanted Sun asserting no control over them (in some of the "Damning" evidence there were internal discussions where Google talks about ignoring licensing not because of financial costs, but because it put Sun at the wheel). J2ME was the disaster it was because of Sun's guardianship.
Android is not Sun. It borrows from some of the tools out of convenience, and uses some of the conventions, but no one is under any illusion that it is the same platform.