Add the internals of RtcEvent's subclasses

webrtc/logging/rtc_event_log/events/rtc_event_audio_receive_stream_config.h

 /*
  *  Copyright (c) 2017 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.
  */
 
 #ifndef WEBRTC_LOGGING_RTC_EVENT_LOG_EVENTS_RTC_EVENT_AUDIO_RECEIVE_STREAM_CONFIG_H_
 #define WEBRTC_LOGGING_RTC_EVENT_LOG_EVENTS_RTC_EVENT_AUDIO_RECEIVE_STREAM_CONFIG_H_
 
+#include <memory>
+
 #include "webrtc/logging/rtc_event_log/events/rtc_event.h"
 
 namespace webrtc {
 
+namespace rtclog {
+struct StreamConfig;
+}  // namespace rtclog
+
 class RtcEventAudioReceiveStreamConfig final : public RtcEvent {
  public:
-  ~RtcEventAudioReceiveStreamConfig() override = default;
+  explicit RtcEventAudioReceiveStreamConfig(
+      std::unique_ptr<rtclog::StreamConfig> config);
+  ~RtcEventAudioReceiveStreamConfig() override;
 
   Type GetType() const override;
 
   bool IsConfigEvent() const override;
+
+  const std::unique_ptr<const rtclog::StreamConfig> config_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_LOGGING_RTC_EVENT_LOG_EVENTS_RTC_EVENT_AUDIO_RECEIVE_STREAM_CONFIG_H_