Replace first_packet_sent_ms_ in Call.

webrtc/modules/congestion_controller/include/send_side_congestion_controller.h

Index: webrtc/modules/congestion_controller/include/send_side_congestion_controller.h
diff --git a/webrtc/modules/congestion_controller/include/send_side_congestion_controller.h b/webrtc/modules/congestion_controller/include/send_side_congestion_controller.h
index 58eba25a7ffaef2165bc1493ce63ee4fcbc10544..66bcb314d2665760ac4d7b660dcbcc2e467ffef4 100644
--- a/webrtc/modules/congestion_controller/include/send_side_congestion_controller.h
+++ b/webrtc/modules/congestion_controller/include/send_side_congestion_controller.h
@@ -88,6 +88,7 @@ class SendSideCongestionController : public CallStatsObserver,
 
   virtual BitrateController* GetBitrateController() const;
   virtual int64_t GetPacerQueuingDelayMs() const;
+  virtual int64_t GetFirstPacketTimeMs() const;
   // TODO(nisse): Delete this accessor function. The pacer should be
   // internal to the congestion controller.
   virtual PacedSender* pacer() { return pacer_.get(); }