I don't think that's exactly the case. Oracle Java has some features that OpenJDK doesn't have. What if Google accelerated development of Open JDK beyond what Oracle is brewing so far that at some point Oracle will have a choice of just taking OpenJDK and stamping their brand on it (probably illegal) or being forgotten Java-wise?
Google would only need to fork and rename though, then Oracle wouldn't be running it. If using the fork were a requirement to running on Android, that's a big draw.
I'm not sure Google is really interested in that though.
I don't think that's exactly the case. Oracle Java has some features that OpenJDK doesn't have. What if Google accelerated development of Open JDK beyond what Oracle is brewing so far that at some point Oracle will have a choice of just taking OpenJDK and stamping their brand on it (probably illegal) or being forgotten Java-wise?