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

webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.h

Index: webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.h
diff --git a/webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.h b/webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.h
index 19ca01bf9ed43c8442bbbb76c845922cc8d0c6b2..d82e4b51570392edf8d48add5781204b503a26b5 100644
--- a/webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.h
+++ b/webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.h
@@ -235,6 +235,8 @@ class AudioCodingModuleImpl : public AudioCodingModule {
 
   void DisableNack() override;
 
+  void SetEventLog(RtcEventLog* event_log) override;
+
   std::vector<uint16_t> GetNackList(int64_t round_trip_time_ms) const override;
 
   void GetDecodingCallStatistics(AudioDecodingCallStats* stats) const override;
@@ -328,6 +330,8 @@ class AudioCodingModuleImpl : public AudioCodingModule {
   AudioPacketizationCallback* packetization_callback_
       GUARDED_BY(callback_crit_sect_);
   ACMVADCallback* vad_callback_ GUARDED_BY(callback_crit_sect_);
+
+  RtcEventLog* event_log_;
 };
 
 }  // namespace acm2