[Partitioned Popins] (3) popin feature triggers third-party storage partitioning
This CL makes use of the new popin window feature to inform whether an
opened popup should be partitioned relative to the opener's StorageKey.
This series of CLs implement core components of the Partitioned Popin
system, significant additional effort will be needed to align with the
explainer and I2P, but all of that will depend on this work:
(1) Implement popin window feature
(2) popin feature triggers tab modal popup
(3) popin feature triggers third-party storage partitioning
Explainer: https://explainers-by-googlers.github.io/partitioned-popins/
I2P: https://groups.google.com/a/chromium.org/g/blink-dev/c/ApU_zUmpQ2g/
Bug: 340606651
Change-Id: I872a4ea76df06c4ab77b8ea596c7302ac8bff839
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5789627
Auto-Submit: Ari Chivukula arichiv@chromium.org
Commit-Queue: Ari Chivukula arichiv@chromium.org
Reviewed-by: Alex Moshchuk alexmos@chromium.org
Cr-Commit-Position: refs/heads/main@{#1343166}