Add WPT for partitioned cookies in ABA context
Add a WPT that covers the behavior of partitioned cookies set in A->B->A contexts, with the ancestor chain bit added to the partition key.
A->B->A context is when a top-level site (A) embeds a cross-site (B) which then embeds the top-level site (A).
Bug: 367722278
Change-Id: I4529a68b91a4b42dd9736d930b60f8958592f200
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5866934
Reviewed-by: Sandor «Alex» Major sandormajor@google.com
Auto-Submit: Aaron Selya selya@google.com
Commit-Queue: Aaron Selya selya@google.com
Cr-Commit-Position: refs/heads/main@{#1356631}