Log audio network adapter decisions in event log.

webrtc/logging/rtc_event_log/rtc_event_log.h

Index: webrtc/logging/rtc_event_log/rtc_event_log.h
diff --git a/webrtc/logging/rtc_event_log/rtc_event_log.h b/webrtc/logging/rtc_event_log/rtc_event_log.h
index ccf60944e2f50067854e57f5dfc9f407720dd631..5d221d4ef8e09285c00bfeb2b932b8928b3cd0dc 100644
--- a/webrtc/logging/rtc_event_log/rtc_event_log.h
+++ b/webrtc/logging/rtc_event_log/rtc_event_log.h
@@ -17,6 +17,7 @@
 #include "webrtc/base/platform_file.h"
 #include "webrtc/call/audio_receive_stream.h"
 #include "webrtc/call/audio_send_stream.h"
+#include "webrtc/modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor.h"
 #include "webrtc/video_receive_stream.h"
 #include "webrtc/video_send_stream.h"
 
@@ -114,6 +115,10 @@ class RtcEventLog {
                                      uint8_t fraction_loss,
                                      int32_t total_packets) = 0;
 
+  // Logs audio encoder re-configuration driven by audio network adaptor.
+  virtual void LogAudioNetworkAdaptation(
+      const AudioNetworkAdaptor::EncoderRuntimeConfig& config) = 0;
+
   // Reads an RtcEventLog file and returns true when reading was successful.
   // The result is stored in the given EventStream object.
   // The order of the events in the EventStream is implementation defined.
@@ -155,6 +160,8 @@ class RtcEventLogNullImpl final : public RtcEventLog {
   void LogBwePacketLossEvent(int32_t bitrate,
                              uint8_t fraction_loss,
                              int32_t total_packets) override {}
+  void LogAudioNetworkAdaptation(
+      const AudioNetworkAdaptor::EncoderRuntimeConfig& config) override{};
 };
 
 }  // namespace webrtc