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Rollback of 3b22db33ba
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add top-level playlist API to ExoPlayer
Public design doc:
https://docs.google.com/document/d/11h0S91KI5TB3NNZUtsCzg0S7r6nyTnF_tDZZAtmY93g
Issue: #6161
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PiperOrigin-RevId: 275276158