Allow ANA to receive RPLR (recoverable packet loss rate) indications

webrtc/modules/audio_coding/codecs/audio_encoder.h

Index: webrtc/modules/audio_coding/codecs/audio_encoder.h
diff --git a/webrtc/modules/audio_coding/codecs/audio_encoder.h b/webrtc/modules/audio_coding/codecs/audio_encoder.h
index 00b7f4619e74f845c0f695104c7bcb1a5ed5c4c5..1cc55fa319403f8fd556d083b780b0043a0d871d 100644
--- a/webrtc/modules/audio_coding/codecs/audio_encoder.h
+++ b/webrtc/modules/audio_coding/codecs/audio_encoder.h
@@ -175,6 +175,13 @@ class AudioEncoder {
   virtual void OnReceivedUplinkPacketLossFraction(
       const rtc::Optional<float>& uplink_packet_loss_fraction);
 
+  // Provides 1st-order-FEC-recoverable uplink packet loss rate to this encoder
+  // to allow it to adapt.
+  // |uplink_recoverable_packet_loss_fraction| is in the range [0.0, 1.0] or
+  // unknown.
+  virtual void OnReceivedUplinkRecoverablePacketLossFraction(
+      const rtc::Optional<float>& uplink_recoverable_packet_loss_fraction);
+
   // Provides target audio bitrate to this encoder to allow it to adapt.
   virtual void OnReceivedTargetAudioBitrate(int target_bps);