[CodeHealth] Rewrite PointerEvent modifier WPT using promise_test.
The test was written as an old-style sync tests, used Promise.all
which made any failures hard to debug because of lack of a clear
resolution order, and didn't assert modifier states individually.
This test passes on headless Chrome but not in content_shell!
Bug: 368980630
Change-Id: I69a08aba7b4cd3719c25ca2e9ec76d77bdaea7fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5994451
Commit-Queue: Kevin Ellis kevers@chromium.org
Auto-Submit: Mustaq Ahmed mustaq@chromium.org
Commit-Queue: Mustaq Ahmed mustaq@chromium.org
Reviewed-by: Kevin Ellis kevers@chromium.org
Cr-Commit-Position: refs/heads/main@{#1378577}