- This makes it so that onDownstreamFormatChanged will occur before the corresponding
renderer event. This was not previously the case, since the renderer would typically
read the format (and report its event), then a sample (causing the
onDownstreamFormatChanged event).
- The remaining ones to update are ChunkSampleStream (DASH + HLS), which will be done
in a way that fixes #4533, and HLS.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=212434874
