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The change https://crrev.com/c/2577150 missed to set this value.
This also adds a unittest to check this (which fails without the fix).

R=rbpotter@chromium.org, thakis@chromium.org

Bug: 862175
Change-Id: I6548804749de242d6ccf1ec4b4c20547dfba2d9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2597249Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838591}