Attach TransportFeedbackPacketLossTracker to ANA (PLR only)

webrtc/modules/congestion_controller/include/congestion_controller.h

Index: webrtc/modules/congestion_controller/include/congestion_controller.h
diff --git a/webrtc/modules/congestion_controller/include/congestion_controller.h b/webrtc/modules/congestion_controller/include/congestion_controller.h
index 6b85f42b15a5695419f21c49202faa67bb40b86a..d01e78a944e4703e5572833d8cab283e7daa97a0 100644
--- a/webrtc/modules/congestion_controller/include/congestion_controller.h
+++ b/webrtc/modules/congestion_controller/include/congestion_controller.h
@@ -99,6 +99,10 @@ class CongestionController : public CallStatsObserver,
   virtual TransportFeedbackObserver* GetTransportFeedbackObserver() {
     return this;
   }
+  void RegisterTransportFeedbackAdapterObserver(
+      TransportFeedbackAdapterObserver* observer);
+  void DeRegisterTransportFeedbackAdapterObserver(
+      TransportFeedbackAdapterObserver* observer);
   RateLimiter* GetRetransmissionRateLimiter();
   void EnablePeriodicAlrProbing(bool enable);
 
@@ -125,7 +129,8 @@ class CongestionController : public CallStatsObserver,
   void Process() override;
 
   // Implements TransportFeedbackObserver.
-  void AddPacket(uint16_t sequence_number,
+  void AddPacket(uint32_t ssrc,
+                 uint16_t sequence_number,
                  size_t length,
                  const PacedPacketInfo& pacing_info) override;
   void OnTransportFeedback(const rtcp::TransportFeedback& feedback) override;