Log created probe clusters to RtcEventLog.

webrtc/modules/pacing/paced_sender.h

Index: webrtc/modules/pacing/paced_sender.h
diff --git a/webrtc/modules/pacing/paced_sender.h b/webrtc/modules/pacing/paced_sender.h
index e69c1d26b8c01d50efc3d4647d652a8c41079845..320e62f076954615745cd6e98165e72b832dfb6b 100644
--- a/webrtc/modules/pacing/paced_sender.h
+++ b/webrtc/modules/pacing/paced_sender.h
@@ -27,6 +27,7 @@ class BitrateProber;
 class Clock;
 class CriticalSectionWrapper;
 class ProbeClusterCreatedObserver;
+class RtcEventLog;
 
 namespace paced_sender {
 class IntervalBudget;
@@ -68,7 +69,9 @@ class PacedSender : public Module, public RtpPacketSender {
   // overshoots from the encoder.
   static const float kDefaultPaceMultiplier;
 
-  PacedSender(const Clock* clock, PacketSender* packet_sender);
+  PacedSender(const Clock* clock,
+              PacketSender* packet_sender,
+              RtcEventLog* event_log);
 
   virtual ~PacedSender();