WebKit should adopt SPI for turning off IOSurface usage in PDFKit
<rdar://problem/101787977>
Pull request: https://github.com/WebKit/WebKit/pull/7724
Committed 258114@main (c1f302ca8b01): <https://commits.webkit.org/258114@main> Reviewed commits have been landed. Closing PR #7724 and removing active labels.