AVPlayer.outputContext.deviceName doesn't return the correct name when playing to multiple devices.
<rdar://problem/66930799>
Created attachment 407509 [details] Patch
Created attachment 407510 [details] Patch
Committed r266312: <https://trac.webkit.org/changeset/266312> All reviewed patches have been landed. Closing bug and clearing flags on attachment 407510 [details].