Some IPC message receivers, e.g., RemoteMediaSessionHelperProxy and RemoteAudioSession, are not enabled in GPUConnectionToWebProcess::dispatchMessage() and GPUProcessConnection::dispatchMessage().
Created attachment 409369 [details] Patch
Created attachment 409371 [details] Fix build failures
Created attachment 409375 [details] Fix build failures - v2
Created attachment 409377 [details] Fix build failures - v3
Committed r267427: <https://trac.webkit.org/changeset/267427> All reviewed patches have been landed. Closing bug and clearing flags on attachment 409377 [details].
<rdar://problem/69384278>