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This adds WebSchedulerTrackedFeature::kWebLocks and registers its use from
LockManager::request.

The test I added failed before I add the code to disable bfcache.

Bug: 1013069
Change-Id: I534cb3b712875459e8e991161b444fe8a03a87c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851634
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705055}