Bug 1692364 [wpt PR 27598] - Add light dismiss by anchor click for <popup>, a=testonly

Bug 1692364 [wpt PR 27598] - Add light dismiss by anchor click for <popup>, a=testonly

Automatic update from web-platform-tests
Add light dismiss by anchor click for <popup>

Prior to this CL, clicking on the anchor for an open <popup> would
cause the popup to be hidden and then immediately re-opened. With
this CL, the anchors for all open popups are also considered when
handling light dismiss events.

This also moves the logic for light dismiss over to the
HTMLPopupElement, to keep Node clean.

Bug: 1168738
Change-Id: Iccd39a481e23dd3ad6c8de35ad9ab1a028d10a85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2691666
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Ionel Popescu <iopopesc@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#853434}

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wpt-commits: dc85237248378dfbae510cd96ab55873209d39c8
wpt-pr: 27598