- In IDLE, the button will now call a preparer. This allows
removal of the separate retry button from the demo app.
- In ENDED, the button will seek back to the default position
and play.
- Behavior is made consistent with LeanbackPlayerAdapter.
Issue: #3689
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=182506855
