Building the CSS filter from a string will be shared between CSS style builder and 2D Canvas.
Pull request: https://github.com/WebKit/WebKit/pull/5479
Committed 255706@main (ea05e83e6142): <https://commits.webkit.org/255706@main> Reviewed commits have been landed. Closing PR #5479 and removing active labels.
<rdar://problem/101317131>