Added protobuf message for loss-based BWE events, and wired it up to the send side bandwidth estima…

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 baf8857559dac6617019ef8cf121f7a0f524560e..7ffb42cb5433b0bf5ae46a30d4cd6f608fb605da 100644
--- a/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
+++ b/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
@@ -19,6 +19,9 @@
 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 
 namespace webrtc {
+
+class RtcEventLog;
+
 class SendSideBandwidthEstimation {
  public:
   SendSideBandwidthEstimation();
@@ -42,6 +45,8 @@ class SendSideBandwidthEstimation {
   void SetMinMaxBitrate(int min_bitrate, int max_bitrate);
   int GetMinBitrate() const;
 
+  void SetEventLog(RtcEventLog* event_log);
+
  private:
   enum UmaState { kNoUpdate, kFirstDone, kDone };
 
@@ -81,6 +86,7 @@ class SendSideBandwidthEstimation {
   int bitrate_at_2_seconds_kbps_;
   UmaState uma_update_state_;
   std::vector<bool> rampup_uma_stats_updated_;
+  RtcEventLog* event_log_;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_BITRATE_CONTROLLER_SEND_SIDE_BANDWIDTH_ESTIMATION_H_