Add the internals of RtcEvent's subclasses

webrtc/logging/rtc_event_log/events/rtc_event_rtp_packet_outgoing.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_RTP_PACKET_OUTGOING_H_
 #define WEBRTC_LOGGING_RTC_EVENT_LOG_EVENTS_RTC_EVENT_RTP_PACKET_OUTGOING_H_
 
 #include "webrtc/logging/rtc_event_log/events/rtc_event.h"
+#include "webrtc/modules/rtp_rtcp/source/rtp_packet.h"
 
 namespace webrtc {
 
+class RtpPacketToSend;
+
 class RtcEventRtpPacketOutgoing final : public RtcEvent {
  public:
-  ~RtcEventRtpPacketOutgoing() override = default;
+  RtcEventRtpPacketOutgoing(const RtpPacketToSend& packet,
+                            int probe_cluster_id);
+  ~RtcEventRtpPacketOutgoing() override;
 
   Type GetType() const override;
 
   bool IsConfigEvent() const override;
+
+  rtp::Packet header_;          // Only the packet's header will be stored here.
+  const size_t packet_length_;  // Length before stripping away all but header.
+  const int probe_cluster_id_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_LOGGING_RTC_EVENT_LOG_EVENTS_RTC_EVENT_RTP_PACKET_OUTGOING_H_