This is a reland of 08c46adc1e9f9a8d74357fe132a68906ae6e6974 Original change's description: > Extracts ssrc based feedback tracking from feedback adapter. > > This prepares for moving TransportFeedbackAdapter to TaskQueue. > > Bug: webrtc:9883 > Change-Id: Ib333f6a6837ff6dd8b10813e8953e4d8cd5d8633 > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/162040 > Reviewed-by: Erik Språng <sprang@webrtc.org> > Commit-Queue: Sebastian Jansson <srte@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#30076} Bug: webrtc:9883 Change-Id: Ia74a3b1fba4d83eece9b0eb6475d6e6aecb65700 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/162201 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30266}