Erik Språng db28555903 Improve test coverage for padding packet generation.
This is a follow-up to r34019. It adds checks for when padding can be
sent before media - and how timestamps are set on RTX padding.

Bug: webrtc:11340
Change-Id: I46fbd3c3eff9e308b5c65220718df749f2d9c46b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219162
Commit-Queue: Erik Språng <sprang@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34041}
2021-05-18 16:47:16 +00:00
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