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This patch adds a display locking fuzzer with the wpt tests as the corpus.
This is using a content fuzzer base to help with the loading, and rafs
a few times depending on input.

R=chrishtr@chromium.org, rakina@chromium.org

Change-Id: I1f1f3dd5e7711158cc1f7a148c226395939cf8d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677008
Commit-Queue: vmpstr <vmpstr@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678439}