olly c808db9935 Add MIME types for which every sample is known to be a sync sample.
- Leaving the TODO, since there are still MIME types we're unsure about.
- Removing AAC because xHE-AAC does not have this property. We may re-add
  it with an additional profile check to exclude xHE-AAC in the future.

PiperOrigin-RevId: 316715147
2020-06-17 14:31:43 +01:00
..