Once https://bugs.webkit.org/show_bug.cgi?id=254725 lands, GPU process for DOM rendering and UI site compositing will be enabled by default on some macOS. Add options to disable them manually in API tests.
Pull request: https://github.com/WebKit/WebKit/pull/12222
Committed 262521@main (c7d1d1292af0): <https://commits.webkit.org/262521@main> Reviewed commits have been landed. Closing PR #12222 and removing active labels.
<rdar://problem/107569803>