tree a703b1ce00f71cf21c6760ffefd6018dbea07906
parent 28b02103abcfb5c26954526940e2721dc84772b2
author Andrew Scull <ascull@google.com> 1574173074 +0000
committer Andrew Scull <ascull@google.com> 1574355713 +0000

Expose preparation and commital update phases.

Some higher level operations such as multi-region atomic updates can
make use of these. Care must be taken to use them correctly so it is
recommended to continue using the previous single call API when
possible.

Change-Id: I05fe433a62a538f38b3274e9418deeb01a053dc7