Fix crash during serialization of animation-range.
As usual, this relates to certain calc() expressions
that cannot be resolved at parse time.
Bug: 40946458
Change-Id: Iadd0c5265e1db1f447e8e35dbacac871be38f122
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6056574
Reviewed-by: Daniil Sakhapov sakhapov@chromium.org
Commit-Queue: Steinar H Gunderson sesse@chromium.org
Cr-Commit-Position: refs/heads/main@{#1389507}