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All of this is put behind a flag disabled by default.
This is mostly based on the initial prototype:
https://chromium-review.googlesource.com/c/chromium/src/+/2223934/24

Define, plumb and use the "report-type" for COOP access reporting.

COOP access reporting:
[1/N] https://chromium-review.googlesource.com/c/chromium/src/+/2264294
[2/N] https://chromium-review.googlesource.com/c/chromium/src/+/2270185
[3/N] https://chromium-review.googlesource.com/c/chromium/src/+/2270472
[4/N] https://chromium-review.googlesource.com/c/chromium/src/+/2273120
[5/N] this patch.

Bug: chromium:1090273
Change-Id: I5e51b3da6a20c85c073ea1fd84ea74557760a42f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309433
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Pâris Meuleman <pmeuleman@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790420}