That would allow us to deal with common messages from more call sites, allowing custom handlers as well. For now I'll propose this mostly fro the AudioDestination.
> AudioDestination Dank Farrik. The message handler is still needed there.
Created attachment 450245 [details] [fast-cq] Patch
Committed r288948 (246677@main): <https://commits.webkit.org/246677@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 450245 [details].
<rdar://problem/88370831>