Apple Silicon GPU Process needs access to IOMobileFramebufferUserClient for certain types of media playback. We allow this on iOS, and in the WebContent process, but missed it in the GPU Process.
<rdar://problem/77591664>
Created attachment 428052 [details] Patch
Committed r277217 (237488@main): <https://commits.webkit.org/237488@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 428052 [details].