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When FEC generation is moved to egress, we'll need to poll bitrates from there instead of the RtpVideoSender. In preparation, refactoring some getter methods. For context, see https://webrtc-review.googlesource.com/c/src/+/173708 Bug: webrtc:11340 Change-Id: Ibc27362361ee9640d9fce676fc8e1093a579344f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/174202 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31214}