IPC thread's QOS should match the sending thread's QOS when calling sendSync(), since it blocks the calling thread.
<rdar://problem/90061548>
Created attachment 454523 [details] Patch
Comment on attachment 454523 [details] Patch r=me
Committed r291203 (248358@main): <https://commits.webkit.org/248358@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 454523 [details].