Hooked up RtcEventLog. It lives in Voice Engine and pointers are propagated to ACM and Call.

webrtc/modules/audio_coding/main/interface/audio_coding_module.h

Index: webrtc/modules/audio_coding/main/interface/audio_coding_module.h
diff --git a/webrtc/modules/audio_coding/main/interface/audio_coding_module.h b/webrtc/modules/audio_coding/main/interface/audio_coding_module.h
index b7d9a91b2f8dcaa3c7355a0d65b3c0653532f728..0d01e81454557aa600586b46c702055e38e33b59 100644
--- a/webrtc/modules/audio_coding/main/interface/audio_coding_module.h
+++ b/webrtc/modules/audio_coding/main/interface/audio_coding_module.h
@@ -26,9 +26,10 @@ namespace webrtc {
 // forward declarations
 struct CodecInst;
 struct WebRtcRTPHeader;
+class AudioEncoderMutable;
 class AudioFrame;
+class RtcEventLog;
 class RTPFragmentationHeader;
-class AudioEncoderMutable;
 
 #define WEBRTC_10MS_PCM_AUDIO 960  // 16 bits super wideband 48 kHz
 
@@ -84,11 +85,13 @@ class AudioCodingModule {
     Config()
         : id(0),
           neteq_config(),
-          clock(Clock::GetRealTimeClock()) {}
+          clock(Clock::GetRealTimeClock()),
+          event_log(nullptr) {}
 
     int id;
     NetEq::Config neteq_config;
     Clock* clock;
+    RtcEventLog* event_log;
   };
 
   ///////////////////////////////////////////////////////////////////////////