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This ensures that media button preferences with slots for BACK, FORWARD and OVERFLOW are converted to the legacy custom layout according to the implicit placement rules. This has to happen when populating the MediaSessionCompat and when generating the notification for older APIs. Sending these preferences to older Media3 controllers can filter them down to the custom layout the session would have used previously, but there is no need to adjust the reservation extras because the older Media3 custom layout has no concept of these extras. PiperOrigin-RevId: 689761637