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

webrtc/voice_engine/channel.h

Index: webrtc/voice_engine/channel.h
diff --git a/webrtc/voice_engine/channel.h b/webrtc/voice_engine/channel.h
index 398087eefb481a0cd96624b6b086c3d9c0acbe58..6d568c047c70a5064940dee744cdeb05a57627bc 100644
--- a/webrtc/voice_engine/channel.h
+++ b/webrtc/voice_engine/channel.h
@@ -51,6 +51,7 @@ class FileWrapper;
 class ProcessThread;
 class ReceiveStatistics;
 class RemoteNtpTimeEstimator;
+class RtcEventLog;
 class RTPPayloadRegistry;
 class RtpReceiver;
 class RTPReceiverAudio;
@@ -448,6 +449,11 @@ public:
     // Disassociate a send channel if it was associated.
     void DisassociateSendChannel(int channel_id);
 
+    // Sets an RtcEventLog object to enable logging of debug events in the Audio
+    // Coding Module. Calling this function with a nullptr is allowed and will
+    // stop all logging activity.
+    void SetEventLog(RtcEventLog* event_log);
+
 protected:
     void OnIncomingFractionLoss(int fraction_lost);