tree 7519869d4600155c4b39abdeca6774dd3cee3408
parent c323b5d1e8bd03908845f4a06af1c25a1d1ea694
author Dave Borowitz <dborowitz@google.com> 1452624964 -0500
committer Dave Borowitz <dborowitz@google.com> 1452726376 -0500

BatchUpdate: Key ChangeUpdates by patch set

Allow callers to create one update per patch set of the change,
looking up by patch set ID and creating as necessary. BatchUpdate will
take care of creating a BatchMetaDataUpdate and applying the updates
in order, oldest patch set to newest patch set.

Force callers to specify the patch set instead of implicitly using the
current patch set. There were some places we were forgetting to do
this, so it's good to have made it required.

We will eventually need to update multiple patch sets at once during
submit, where approvals may be copied between patch sets.

Change-Id: I35e9378d6f9b494db516f8d8c38c5b6e75c2f4c7