[WIP] Sketching out Sec-Fetch-Ancestors
#45981
Draft
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w3c/webappsec-fetch-metadata#56
Change-Id: I91e072ddd777150c973ad24f3f729cb2fd979232
Reviewed-on: https://chromium-review.googlesource.com/2189658
WPT-Export-Revision: a7184d82d7cde3e5db10bb62d818922849b966fd