[css-anchor-position] Create scroll node for scrolled overflow:hidden
This makes sure cc::TransformTree::AnchorPositionOffset can get the
scroll offset of scrolled overflow:hidden adjustment containers.
Bug: 332331854
Change-Id: Ib3c0c49af5746714c94a03e0ae25574df3b50f91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5503383
Reviewed-by: Philip Rogers pdr@chromium.org
Commit-Queue: Xianzhu Wang wangxianzhu@chromium.org
Cr-Commit-Position: refs/heads/main@{#1296415}