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 b8ba3b5a2cb33e672801c0eef152192d752c4067..44abd74667a1784ebe01b873fec79e1c5e045756 100644
--- a/webrtc/modules/congestion_controller/include/congestion_controller.h
+++ b/webrtc/modules/congestion_controller/include/congestion_controller.h
@@ -97,6 +97,10 @@ class CongestionController : public CallStatsObserver,
   virtual TransportFeedbackObserver* GetTransportFeedbackObserver() {
     return this;
   }
+  void RegisterTransportFeedbackAdapterObserver(
+      TransportFeedbackAdapterObserver* observer);
+  void DeRegisterTransportFeedbackAdapterObserver(
+      TransportFeedbackAdapterObserver* observer);
   RateLimiter* GetRetransmissionRateLimiter();
   void EnablePeriodicAlrProbing(bool enable);
 
@@ -123,7 +127,8 @@ 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;