kimvde 7c3cffdebe Change FallbackListener registerTrack to setTrackCount
AssetLoader declares the tracks with a setTrackCount() method. Setting
the track count on the FallbackListener is easier than calling
registerTrack() as many times as the number of tracks.

PiperOrigin-RevId: 496919969
2023-01-04 21:25:44 +00:00
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