Add the internals of RtcEvent's subclasses

webrtc/logging/rtc_event_log/events/rtc_event.h

Index: webrtc/logging/rtc_event_log/events/rtc_event.h
diff --git a/webrtc/logging/rtc_event_log/events/rtc_event.h b/webrtc/logging/rtc_event_log/events/rtc_event.h
index 86d978c3b6182f3a2792bdd492900ffab0cc9e39..94322fd55ac3f4da2f4959f6c33b443750768da7 100644
--- a/webrtc/logging/rtc_event_log/events/rtc_event.h
+++ b/webrtc/logging/rtc_event_log/events/rtc_event.h
@@ -11,6 +11,12 @@
 #ifndef WEBRTC_LOGGING_RTC_EVENT_LOG_EVENTS_RTC_EVENT_H_
 #define WEBRTC_LOGGING_RTC_EVENT_LOG_EVENTS_RTC_EVENT_H_
 
+#include <webrtc/typedefs.h>
+
+namespace rtc {
+int64_t TimeMicros();
+}  // namespace rtc
+
 namespace webrtc {
 
 // This class allows us to store unencoded RTC events. Subclasses of this class
@@ -45,11 +51,14 @@ class RtcEvent {
     VideoSendStreamConfig
   };
 
+  RtcEvent() : timestamp_us_(rtc::TimeMicros()) {}
   virtual ~RtcEvent() = default;
 
   virtual Type GetType() const = 0;
 
   virtual bool IsConfigEvent() const = 0;
+
+  const int64_t timestamp_us_;
 };
 
 }  // namespace webrtc