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debug::Alias did the trick. We were dividing by zero whenever a record
with significant duration was saved to an empty bucket.

Pretty awful bug. UMA shows this is causing 2% of DB reads to be
discarded (assuming this is the sole remaining source of corruption).

Bug: 982009
Change-Id: Ie13643a79652163bfaf343259af44141f2a53fc7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854796
Auto-Submit: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704996}