Allows audio bitrate allocation in video calls without enabling TWCC (Transport Wide Congestion Control as defined at https://tools.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01.html) for audio stream.

This will allow experimenting with audio bitrate allocation in video calls without increasing transport overhead.

Bug: webrtc:8243
Change-Id: If961780921d53bdce95b68c26641df6875509c1f
Reviewed-on: https://webrtc-review.googlesource.com/84501
Commit-Queue: Alex Narest <alexnarest@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23755}
diff --git a/call/rtp_transport_controller_send.h b/call/rtp_transport_controller_send.h
index 0027696..d9a4e18 100644
--- a/call/rtp_transport_controller_send.h
+++ b/call/rtp_transport_controller_send.h
@@ -85,6 +85,8 @@
   void SetSdpBitrateParameters(const BitrateConstraints& constraints) override;
   void SetClientBitratePreferences(const BitrateSettings& preferences) override;
 
+  void SetAllocatedBitrateWithoutFeedback(uint32_t bitrate_bps) override;
+
  private:
   const Clock* const clock_;
   PacketRouter packet_router_;