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These are the remaining setter operations. They all share the same logic that handles playlist and/or position changes. The logic to create the placeholder state is mostly copied from ExoPlayerImpl's maskTimelineAndPosition and getPeriodPositonUsAfterTimelineChanged. PiperOrigin-RevId: 496364712 (cherry picked from commit 5fa115641d5b45b106844f3e629372417eb100b1)