[mparch] Add a prerender test to check COOP and COEP. Prerendering should not affect the primary main frame's COOP and COEP policies. Bug: 1349201 Change-Id: I1eb76b5654655a0b07379d20c8a68034bdd807bd Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3801679 Commit-Queue: Hyowon Kim <hyowon@igalia.com> Reviewed-by: Kevin McNee <mcnee@chromium.org> Reviewed-by: Avi Drissman <avi@chromium.org> Cr-Commit-Position: refs/heads/main@{#1031328}
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