Adds target rate to audio send stream stats.

Bug: webrtc:9510
Change-Id: I8bd74fc115e3006f477b289edc58fa1f9d7b6bc6
Reviewed-on: https://webrtc-review.googlesource.com/c/107652
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25370}
diff --git a/audio/channel_send.cc b/audio/channel_send.cc
index bdabe8f..83350c4 100644
--- a/audio/channel_send.cc
+++ b/audio/channel_send.cc
@@ -572,6 +572,11 @@
     }
   });
   retransmission_rate_limiter_->SetMaxRate(bitrate_bps);
+  configured_bitrate_bps_ = bitrate_bps;
+}
+
+int ChannelSend::GetBitRate() const {
+  return configured_bitrate_bps_;
 }
 
 void ChannelSend::OnTwccBasedUplinkPacketLossRate(float packet_loss_rate) {