Testing with multiple speakers revealed that the GPU Process is not able to communicate with a mach service needed to coordinate audio playback. This patch corrects this issue.
<rdar://problem/76029596>
Created attachment 433539 [details] Patch
Committed r279951 (239694@main): <https://commits.webkit.org/239694@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 433539 [details].