Log created probe clusters to RtcEventLog.

webrtc/modules/congestion_controller/send_side_congestion_controller.cc

Index: webrtc/modules/congestion_controller/send_side_congestion_controller.cc
diff --git a/webrtc/modules/congestion_controller/send_side_congestion_controller.cc b/webrtc/modules/congestion_controller/send_side_congestion_controller.cc
index 782c060f000e01f701b7416f8572e8a6eee6ab92..e0918d7b765b1c128ceea0faf5928df68ecea1cb 100644
--- a/webrtc/modules/congestion_controller/send_side_congestion_controller.cc
+++ b/webrtc/modules/congestion_controller/send_side_congestion_controller.cc
@@ -53,8 +53,8 @@ SendSideCongestionController::SendSideCongestionController(
           clock,
           observer,
           event_log,
-          std::unique_ptr<PacedSender>(new PacedSender(clock, packet_router))) {
-}
+          std::unique_ptr<PacedSender>(
+              new PacedSender(clock, packet_router, event_log))) {}
 
 SendSideCongestionController::SendSideCongestionController(
     const Clock* clock,