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This implementation is consistent with the documentation in
histograms.xml.

Change-Id: Ib85a290def5f09ef07f4a0740d4cc6f3ab9a7224
Bug: 1068378
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517943
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823724}