Another fix to expectations for pointerevents after slot changes.
All composed events at parent are additionally dispatched to
shadow_root. This fixes a crack in the previous CL [1] that omitted
pointerover/out events.
[1] https://chromium-review.googlesource.com/c/chromium/src/+/5640796
Manual test link: https://codepen.io/mustaqahmed/full/BaeRvdZ
Bug: 40156858
Change-Id: Ifccc48a066620b672030aee9be937b75d7e88f54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5644338
Reviewed-by: Kevin Ellis kevers@chromium.org
Commit-Queue: Mustaq Ahmed mustaq@chromium.org
Auto-Submit: Mustaq Ahmed mustaq@chromium.org
Cr-Commit-Position: refs/heads/main@{#1318695}