OnReceivedUplinkPacketLossFraction() receives [const rtc::Optional<float>&]

webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc

Index: webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
diff --git a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
index bac963f4e8e2de9ff047ac78d889e9b187c6469e..5b58da4857db3ccf95350b2f0874fb16b18a8c17 100644
--- a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
+++ b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
@@ -293,15 +293,19 @@ void AudioEncoderOpus::DisableAudioNetworkAdaptor() {
 }
 
 void AudioEncoderOpus::OnReceivedUplinkPacketLossFraction(
-    float uplink_packet_loss_fraction) {
+    const rtc::Optional<float>& uplink_packet_loss_fraction) {
   if (!audio_network_adaptor_) {
-    packet_loss_fraction_smoother_->AddSample(uplink_packet_loss_fraction);
-    float average_fraction_loss = packet_loss_fraction_smoother_->GetAverage();
-    return SetProjectedPacketLossRate(average_fraction_loss);
+    if (uplink_packet_loss_fraction) {
+      packet_loss_fraction_smoother_->AddSample(*uplink_packet_loss_fraction);
+      float average_fraction_loss =
+          packet_loss_fraction_smoother_->GetAverage();
+      SetProjectedPacketLossRate(average_fraction_loss);
+    }
+  } else {
+    audio_network_adaptor_->SetUplinkPacketLossFraction(
+        uplink_packet_loss_fraction);
+    ApplyAudioNetworkAdaptor();
   }
-  audio_network_adaptor_->SetUplinkPacketLossFraction(
-      uplink_packet_loss_fraction);
-  ApplyAudioNetworkAdaptor();
 }
 
 void AudioEncoderOpus::OnReceivedUplinkBandwidth(