GitLab

These histograms are still used for tracking regressions for heavy
ad intervention.

Bug: 1156208,1156210,1156211,1156212
Change-Id: I17067bfffa6b8bb143bae85ce475ef37a80fa7e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622318Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: John Delaney <johnidel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843722}