Log to RtcEventLog when loss based estimate is changed.

webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h

Index: webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
diff --git a/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h b/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
index 84ee882982bdd465ede7b9a3923cea8f6969e984..b336dd8fa4dda5fd41d6be7f5b88bb59eaf0e90e 100644
--- a/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
+++ b/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
@@ -69,13 +69,15 @@ class SendSideBandwidthEstimation {
   // min bitrate used during last kBweIncreaseIntervalMs.
   void UpdateMinHistory(int64_t now_ms);
 
+  void CapAndLogBitrate(int64_t now_ms, uint32_t bitrate_bps);
+
   std::deque<std::pair<int64_t, uint32_t> > min_bitrate_history_;
 
   // incoming filters
   int lost_packets_since_last_loss_update_Q8_;
   int expected_packets_since_last_loss_update_;
 
-  uint32_t bitrate_;
+  uint32_t current_bitrate_bps_;
   uint32_t min_bitrate_configured_;
   uint32_t max_bitrate_configured_;
   int64_t last_low_bitrate_log_ms_;