tianyifeng 733301d562 Remove the parameter PlayerId from PreloadMediaSource.Factory
Originally a `PlayerId` has to be passed and it should be the same id of the player who is going to play the sources, but it turns out to be unnecessary.

When preloading, we can set a `PlayerId.UNSET` inside of the `PreloadMediaSource`, as there is no ongoing playback. And when the source is handed over to player, player will set the player's `PlayerId`.

PiperOrigin-RevId: 597475119
2024-01-11 00:48:58 -08:00
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