Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/modules/rtp_rtcp/include/rtp_rtcp.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 57 matching lines @@
     TransportFeedbackObserver* transport_feedback_callback;
     RtcpRttStats* rtt_stats;
     RtcpPacketTypeCounterObserver* rtcp_packet_type_counter_observer;
     RtpAudioFeedback* audio_messages;
     RemoteBitrateEstimator* remote_bitrate_estimator;
     RtpPacketSender* paced_sender;
     TransportSequenceNumberAllocator* transport_sequence_number_allocator;
     BitrateStatisticsObserver* send_bitrate_observer;
     FrameCountObserver* send_frame_count_observer;
     SendSideDelayObserver* send_side_delay_observer;
-    RtcEventLog* event_log;

[stefan-webrtc, 2016/03/03 10:08:25]

Why do we have to make this change? If it really is needed to change this after
construction, then I'd prefer to set a proxy here instead and change the object
in the proxy instead.

[the sun, 2016/03/03 10:17:15]

That's a good idea! Put the proxy among the others in voice_engine/channel.cc;
we still need to be able to set the event log on voe::Channel after
construction.

[ivoc, 2016/03/10 13:15:36]

The reason for this change is that we no longer have the RtcEventLog* available
at the place where the VoE Channel is constructed (which is where the RtpRtcp
class is constructed) in the new setup. When constructing a ChannelProxy inside
the AudioReceiveStream, it doesn't actually construct a VoE Channel, but rather
finds the one with the correct channel id. 
I will implement a proxy for the event log like you suggest.

 
     RTC_DISALLOW_COPY_AND_ASSIGN(Configuration);
   };
 
   /*
    *   Create a RTP/RTCP module object using the system clock.
    *
    *   configuration  - Configuration of the RTP/RTCP module.
    */
   static RtpRtcp* CreateRtpRtcp(const RtpRtcp::Configuration& configuration);
@@ skipping 553 matching lines @@
     *   return -1 on failure else 0
     */
     virtual int32_t SetKeyFrameRequestMethod(KeyFrameRequestMethod method) = 0;
 
     /*
     *   send a request for a keyframe
     *
     *   return -1 on failure else 0
     */
     virtual int32_t RequestKeyFrame() = 0;
+
+    /*
+     *  Set the RtcEventLog object.
+     */
+    virtual void SetRtcEventLog(webrtc::RtcEventLog* event_log) = 0;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_RTCP_H_