[MSE] Use CMSampleBufferGetOutputPresentationTime / CMSampleBufferGetOutputDuration for all presentation times and durations
<rdar://problem/55271538>
Created attachment 393068 [details] Patch
Created attachment 393070 [details] Patch
Created attachment 393071 [details] Patch
Comment on attachment 393071 [details] Patch Clearing flags on attachment: 393071 Committed r258215: <https://trac.webkit.org/changeset/258215>
All reviewed patches have been landed. Closing bug.