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Implementation is going through changes and these histograms help
monitor regressions.

Change-Id: I4902903f1bf434b346e2e0f930619bdd145d3be8
Fixed: 1125783
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440057
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811987}