Pass time constant to bwe smoothing filter.

webrtc/audio/audio_send_stream.h

Index: webrtc/audio/audio_send_stream.h
diff --git a/webrtc/audio/audio_send_stream.h b/webrtc/audio/audio_send_stream.h
index bb619cf2b5496266224f7d96e62ca1552a846d6e..f884852d5d52c0e452f4b3380d5a43027d17b332 100644
--- a/webrtc/audio/audio_send_stream.h
+++ b/webrtc/audio/audio_send_stream.h
@@ -54,7 +54,8 @@ class AudioSendStream final : public webrtc::AudioSendStream,
   // Implements BitrateAllocatorObserver.
   uint32_t OnBitrateUpdated(uint32_t bitrate_bps,
                             uint8_t fraction_loss,
-                            int64_t rtt) override;
+                            int64_t rtt,
+                            int64_t probing_interval_ms) override;
 
   const webrtc::AudioSendStream::Config& config() const;
   void SetTransportOverhead(int transport_overhead_per_packet);