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

webrtc/voice_engine/voe_base_impl.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 35 matching lines @@
   int StopSend(int channel) override;
 
   int GetVersion(char version[1024]) override;
 
   int LastError() override;
 
   AudioTransport* audio_transport() override { return this; }
 
   int AssociateSendChannel(int channel, int accociate_send_channel) override;
 
+  RtcEventLog* GetEventLog() override;
+
   // AudioTransport
   int32_t RecordedDataIsAvailable(const void* audioSamples, uint32_t nSamples,
                                   uint8_t nBytesPerSample, uint8_t nChannels,
                                   uint32_t samplesPerSec, uint32_t totalDelayMS,
                                   int32_t clockDrift, uint32_t micLevel,
                                   bool keyPressed,
                                   uint32_t& newMicLevel) override;
   int32_t NeedMorePlayData(uint32_t nSamples, uint8_t nBytesPerSample,
                            uint8_t nChannels, uint32_t samplesPerSec,
                            void* audioSamples, uint32_t& nSamplesOut,
@@ skipping 58 matching lines @@
   VoiceEngineObserver* voiceEngineObserverPtr_;
   CriticalSectionWrapper& callbackCritSect_;
 
   AudioFrame audioFrame_;
   voe::SharedData* shared_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VOICE_ENGINE_VOE_BASE_IMPL_H