Reland of Log created probe clusters to RtcEventLog.

webrtc/modules/pacing/bitrate_prober.cc

Index: webrtc/modules/pacing/bitrate_prober.cc
diff --git a/webrtc/modules/pacing/bitrate_prober.cc b/webrtc/modules/pacing/bitrate_prober.cc
index dd9ee3325758d93ee9e930a3ce97deb3ff6dd8b8..e4de4a8dadc120c869b91dd4110ac887e34692e9 100644
--- a/webrtc/modules/pacing/bitrate_prober.cc
+++ b/webrtc/modules/pacing/bitrate_prober.cc
@@ -14,6 +14,7 @@
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
+#include "webrtc/logging/rtc_event_log/rtc_event_log.h"
 #include "webrtc/modules/pacing/paced_sender.h"
 
 namespace webrtc {
@@ -45,10 +46,13 @@
 
 }  // namespace
 
-BitrateProber::BitrateProber()
+BitrateProber::BitrateProber() : BitrateProber(nullptr) {}
+
+BitrateProber::BitrateProber(RtcEventLog* event_log)
     : probing_state_(ProbingState::kDisabled),
       next_probe_time_ms_(-1),
-      next_cluster_id_(0) {
+      next_cluster_id_(0),
+      event_log_(event_log) {
   SetEnabled(true);
 }
 
@@ -95,6 +99,11 @@
   cluster.pace_info.send_bitrate_bps = bitrate_bps;
   cluster.pace_info.probe_cluster_id = next_cluster_id_++;
   clusters_.push(cluster);
+  if (event_log_)
+    event_log_->LogProbeClusterCreated(
+        cluster.pace_info.probe_cluster_id, cluster.pace_info.send_bitrate_bps,
+        cluster.pace_info.probe_cluster_min_probes,
+        cluster.pace_info.probe_cluster_min_bytes);
 
   LOG(LS_INFO) << "Probe cluster (bitrate:min bytes:min packets): ("
                << cluster.pace_info.send_bitrate_bps << ":"