GTK4 requires GL in the UI process, but it's still useful to allow disabling compositing mode in the web process to reduce memory usage and debugging purposes.
Pull request: https://github.com/WebKit/WebKit/pull/4050
Committed 254221@main (5b10b791568f): <https://commits.webkit.org/254221@main> Reviewed commits have been landed. Closing PR #4050 and removing active labels.