tree 1afd00770f13192d3617238d3d5c6ffb2da525ac
parent 0dcaf8be2b9cfb39c1fc413c7d9c3339cbcfe8ce
author Xiaocheng Hu <xiaochengh@chromium.org> 1667266503 -0700
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1667267355 -0700

[anchor-position] Reimplement anchor-scroll with ScrollSnapshotClient

Per spec discussion [1], this patch re-implement anchor-scroll with
ScrollSnapshotClient [2] that it takes a snapshot of the relevant
scrollers at the beginning of an animation frame, and then uses the snapshot for layout & paint adjustments.

[1] https://github.com/tabatkins/specs/issues/91. Revision incoming...
[2] https://chromium-review.googlesource.com/c/chromium/src/+/3966988

Bug: 1371217
Change-Id: I2566726bfc500b24e335271ef84bbc18395efff7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3969547
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1065775}