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For increased test coverage. I plan to start enabling it on
Dev/Canary soon once existing bugs are addressed, and eventually
launch to Stable.

Bug: 824858
Change-Id: I71374bdc94b32ba24fcbbd8ab86df90c735dd637
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786881
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695883}