Multiple Ms can offer Events with identical timestamps. The Reader
edits those so the timestamps are strictly increasing, but it needs a
way to break the tie. Use something deterministic (such as the order of
the batches), rather than map iteration order.
Updates #68277
Change-Id: I4a1f70c1669ce1c9b52d09e2bc99acbc831ef9a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/596355
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com> Reviewed-by: Carlos Amedee <carlos@golang.org> Reviewed-by: Than McIntosh <thanm@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>