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Track how often each permission check cause Permission Denied failures.
Now only record Permission Denied failures caused by CORS.

TODO: Record other Permission Denied failures.

Explainer: https://github.com/WICG/raw-sockets/blob/master/docs/explainer.md

Bug: 1119681
Change-Id: I70e697143fac58e99cf1006c6326de00ebda2f6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638956
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846415}