Log probe results to RtcEventLog.

webrtc/modules/congestion_controller/probe_bitrate_estimator.h

Index: webrtc/modules/congestion_controller/probe_bitrate_estimator.h
diff --git a/webrtc/modules/congestion_controller/probe_bitrate_estimator.h b/webrtc/modules/congestion_controller/probe_bitrate_estimator.h
index 66413400923ed63f11a8490b141b98a29e20da92..247e905fd0b42140f25ca126250b4f7e0a44fe07 100644
--- a/webrtc/modules/congestion_controller/probe_bitrate_estimator.h
+++ b/webrtc/modules/congestion_controller/probe_bitrate_estimator.h
@@ -17,10 +17,11 @@
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 
 namespace webrtc {
+class RtcEventLog;
 
 class ProbeBitrateEstimator {
  public:
-  ProbeBitrateEstimator();
+  explicit ProbeBitrateEstimator(RtcEventLog* event_log);
 
   // Should be called for every probe packet we receive feedback about.
   // Returns the estimated bitrate if the probe completes a valid cluster.
@@ -42,6 +43,7 @@ class ProbeBitrateEstimator {
   void EraseOldClusters(int64_t timestamp_ms);
 
   std::map<int, AggregatedCluster> clusters_;
+  RtcEventLog* const event_log_;
 };
 
 }  // namespace webrtc