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There was an integer division error in reporting one of our percentages.
Fix it, and add a test to cover the case.

Bug: None
Change-Id: Ibc1993852644c86fdfe356862cbb8e5bc51644dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2265420Reviewed-by: Caroline Rising <corising@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782684}