RTC[In/Out]boundRTPStreamStats.mediaTrackId collected.

webrtc/api/trackmediainfomap.h

 /*
  *  Copyright 2016 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 15 matching lines @@
 class TrackMediaInfoMap {
  public:
   TrackMediaInfoMap(std::unique_ptr<cricket::VoiceMediaInfo> voice_media_info,
                     std::unique_ptr<cricket::VideoMediaInfo> video_media_info);
 
   void Initialize(
       const std::vector<rtc::scoped_refptr<RtpSenderInterface>>& rtp_senders,
       const std::vector<rtc::scoped_refptr<RtpReceiverInterface>>&
           rtp_receivers);
 
-  const cricket::VoiceMediaInfo& voice_media_info() const {
-    return *voice_media_info_;
+  const cricket::VoiceMediaInfo* voice_media_info() const {
+    return voice_media_info_.get();
   }
-  const cricket::VideoMediaInfo& video_media_info() const {
-    return *video_media_info_;
+  const cricket::VideoMediaInfo* video_media_info() const {
+    return video_media_info_.get();
   }
 
   const std::vector<cricket::VoiceSenderInfo*>* GetVoiceSenderInfos(
       const AudioTrackInterface& local_audio_track) const;
   const cricket::VoiceReceiverInfo* GetVoiceReceiverInfo(
       const AudioTrackInterface& remote_audio_track) const;
   const std::vector<cricket::VideoSenderInfo*>* GetVideoSenderInfos(
       const VideoTrackInterface& local_video_track) const;
   const cricket::VideoReceiverInfo* GetVideoReceiverInfo(
       const VideoTrackInterface& remote_video_track) const;
@@ skipping 27 matching lines @@
       rtc::scoped_refptr<AudioTrackInterface>> voice_receiver_info_to_track_;
   std::map<const cricket::VideoSenderInfo*,
       rtc::scoped_refptr<VideoTrackInterface>> video_sender_info_to_track_;
   std::map<const cricket::VideoReceiverInfo*,
       rtc::scoped_refptr<VideoTrackInterface>> video_receiver_info_to_track_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_TRACKMEDIAINFOMAP_H_