This should be a pretty simple one. We haven't fully finalized the foundations yet, but it should be getting close.

I will take this bug (with saklein@'s help) to get more familiarity of the system 

See also crbug.com/914988

A couple of notes....

Uprev requires a chroot.

It is board specific, but easy do do for all boards. Doing it for all boards does affect performance.

Tweak the title a bit.. Let me know if anyone disagrees

We already have a prototype that just calls into the existing script, so porting to the Build API does not block Parallel CQ.

Per crbug.com/914988 we would *prefer* to have an option to do the actual commit pushes from the recipe rather than bundled into the `cros_mark_as_stable push` subcommand, but that does not strictly block us either.