[anchor-position] Allow ::backdrop to use originating element's implicit anchor #40894
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A previous patch made ::before and ::after use originating element's
implicit anchor element.
As the spec change (*) also added ::backdrop to the list, this patch
implements that.
(*) w3c/csswg-drafts#9037
Bug: 1309178
Change-Id: I9dbc1c0ad1c589cc283adf9a970f163f88569839
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4661777
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Auto-Submit: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1166868}