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 ec57b8b394f45e1d9c719be1a78dc4738ee0e42b..e5946d86737dec6d4fdd7a52da8c70905e0fb4b4 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/api/call/audio_receive_stream.h"
 #include "webrtc/api/call/audio_send_stream.h"
 #include "webrtc/base/platform_file.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"
 
@@ -108,6 +109,10 @@ class RtcEventLog {
                                      uint8_t fraction_loss,
                                      int32_t total_packets) = 0;
 
+  // Logs audio encoder configuration changes.
+  virtual void LogAudioEncoderConfig(
+      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.
@@ -149,6 +154,8 @@ class RtcEventLogNullImpl final : public RtcEventLog {
   void LogBwePacketLossEvent(int32_t bitrate,
                              uint8_t fraction_loss,
                              int32_t total_packets) override {}
+  void LogAudioEncoderConfig(
+      const AudioNetworkAdaptor::EncoderRuntimeConfig& config) override{};
 };
 
 }  // namespace webrtc