Add the internals of RtcEvent's subclasses

webrtc/logging/rtc_event_log/events/rtc_event_bwe_update_delay_based.cc

 /*
  *  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.
  */
 
 #include "webrtc/logging/rtc_event_log/events/rtc_event_bwe_update_delay_based.h"
 
+#include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h"
+
 namespace webrtc {
 
+RtcEventBweUpdateDelayBased::RtcEventBweUpdateDelayBased(
+    int32_t bitrate_bps,
+    BandwidthUsage detector_state)
+    : bitrate_bps_(bitrate_bps), detector_state_(detector_state) {}
+
+RtcEventBweUpdateDelayBased::~RtcEventBweUpdateDelayBased() = default;
+
 RtcEvent::Type RtcEventBweUpdateDelayBased::GetType() const {
   return RtcEvent::Type::BweUpdateDelayBased;
 }
 
 bool RtcEventBweUpdateDelayBased::IsConfigEvent() const {
   return false;
 }
 
 }  // namespace webrtc