- Code is simpler. We only ever reset all tracks.
- Allows the standalone media clock to be updated properly. This
allows simpler recovery for live streams in ExtractorSampleSource.
- Fixes #1285 and paves the way for a fix for #758.
Issue: #1285
Issue: #758
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=120530682
