tree bedf244378ac2c7d0a2f530ef1fdbbddbfb72878
parent 3debd30560954e3ce8ff4186e413d0a54e6fb064
author ulfjack <ulfjack@google.com> 1550751717 -0800
committer Copybara-Service <copybara-worker@google.com> 1550751809 -0800

Wait for shared actions asynchronously

Instead of blocking the current thread, shared actions are waited for
using the ListenableFuture mechanism in Skyframe.

Also clean up the API a bit.

Progress on #6394.

PiperOrigin-RevId: 234970927