Fix crash on calc() in keyframe animation offsets.
We use the metrics from the initial style (like with media queries),
as specified in css-values-4. This still does not resolve what we
are to do with values related to an element, though
(e.g. sibling-index()).
Bug: 40946458
Change-Id: Ibe8002fe30eb062351311d8b4c8ecf90dea6c285
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6058974
Commit-Queue: Steinar H Gunderson sesse@chromium.org
Reviewed-by: Daniil Sakhapov sakhapov@chromium.org
Reviewed-by: Anders Hartvoll Ruud andruud@chromium.org
Cr-Commit-Position: refs/heads/main@{#1389780}