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in particular change bitrate type to int64_t to follow style guide. With an extra interface it will allow to add both RtpRtcp module and RtcpTransceiver as feedback sender to PacketRouter Bug: webrtc:8239 Change-Id: I9ea265686d7cd2d709f0b42e8a983ebe1790a6ba Reviewed-on: https://webrtc-review.googlesource.com/32302 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Philip Eliasson <philipel@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21250}