[GPUP] MediaSource.addSourceBuffer() will throw if given the same parameter as a previous call to HTMLMediaElement.canPlayType()
<rdar://74805071>
Created attachment 425365 [details] Patch
Committed r275934 (236496@main): <https://commits.webkit.org/236496@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 425365 [details].