Add the internals of RtcEvent's subclasses

webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.cc

Index: webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.cc
diff --git a/webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.cc b/webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.cc
index 801aa98e2686818d3fd0ff4dd16d12a87d9501ae..60369608b479b585a1a97daf7cb3a2e92765a28a 100644
--- a/webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.cc
+++ b/webrtc/logging/rtc_event_log/events/rtc_event_logging_stopped.cc
@@ -12,6 +12,9 @@
 
 namespace webrtc {
 
+RtcEventLoggingStopped::RtcEventLoggingStopped(int64_t timestamp_us)
+    : timestamp_us_(timestamp_us) {}
+
 RtcEvent::Type RtcEventLoggingStopped::GetType() const {
   return RtcEvent::Type::LoggingStopped;
 }