Instantly pass network changes to controllers in audio network adaptor.

webrtc/modules/audio_coding/audio_network_adaptor/controller.h

Index: webrtc/modules/audio_coding/audio_network_adaptor/controller.h
diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/controller.h b/webrtc/modules/audio_coding/audio_network_adaptor/controller.h
index 4f97804317cfcff59c62642d7b5b438ff1592b2d..7679a58734b536d71113035b2a5ce8731c9464d7 100644
--- a/webrtc/modules/audio_coding/audio_network_adaptor/controller.h
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/controller.h
@@ -30,8 +30,11 @@ class Controller {
 
   virtual ~Controller() = default;
 
+  // Informs network metrics update to this controller. Any non-empty field
+  // indicates an update on the corresponding network metric.
+  virtual void UpdateNetworkMetrics(const NetworkMetrics& network_metrics) = 0;
+
   virtual void MakeDecision(
-      const NetworkMetrics& metrics,
       AudioNetworkAdaptor::EncoderRuntimeConfig* config) = 0;
 };