We serialize to values like `lch(50 Infinity 0)` which are invalid at parse-time. Serialize infinity to `calc(infinity)` instead, which is valid in CSS.
<rdar://problem/114808320>
Pull request: https://github.com/WebKit/WebKit/pull/17330
Committed 267544@main (ec9f0db07e3e): <https://commits.webkit.org/267544@main> Reviewed commits have been landed. Closing PR #17330 and removing active labels.