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I have promised a few times that I would extract these tests once they
reached a critical mass and I had a minute. That time has come.

Bug: chromium:1167697
Change-Id: I5808dfa7bfac32190c39354895096c9e0679a398
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632681
Commit-Queue: Titouan Rigoudy <titouan@chromium.org>
Auto-Submit: Titouan Rigoudy <titouan@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844712}