Fix !important parsing for more properties.
In particular, for filter, backdrop-filter and will-change.
Change-Id: I86237fb6d3eee3f15b66a0ad521010c0b507cad5
Bug: 340100643
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5557487
Commit-Queue: Steinar H Gunderson sesse@chromium.org
Auto-Submit: Steinar H Gunderson sesse@chromium.org
Reviewed-by: Rune Lillesveen futhark@chromium.org
Cr-Commit-Position: refs/heads/main@{#1304968}