Add the internals of RtcEvent's subclasses

webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.h

Index: webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.h
diff --git a/webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.h b/webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.h
index 05a3c52e21875a8d6fa75a254e080ddb1446c2f1..3bfd1ec5165e369c384b4191043574c87afd2941 100644
--- a/webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.h
+++ b/webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.h
@@ -12,14 +12,18 @@
 #define WEBRTC_LOGGING_RTC_EVENT_LOG_EVENTS_RTC_EVENT_LOGGING_STOPPED_H_
 
 #include "webrtc/logging/rtc_event_log/events/rtc_event.h"
+#include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 class RtcEventLoggingStopped final : public RtcEvent {
  public:
+  explicit RtcEventLoggingStopped(int64_t timestamp_us);
   ~RtcEventLoggingStopped() override = default;
 
   Type GetType() const override;
+
+  int64_t timestamp_us_;
 };
 
 }  // namespace webrtc