Parse FlexFEC RTP headers in Call and add integration with BWE.

webrtc/modules/congestion_controller/congestion_controller.cc

Index: webrtc/modules/congestion_controller/congestion_controller.cc
diff --git a/webrtc/modules/congestion_controller/congestion_controller.cc b/webrtc/modules/congestion_controller/congestion_controller.cc
index bbdd968dc668f6c51587b891f700c96e39dbcc42..2fae264156fd3efc4d3b5ed10bf3789f202bb23d 100644
--- a/webrtc/modules/congestion_controller/congestion_controller.cc
+++ b/webrtc/modules/congestion_controller/congestion_controller.cc
@@ -197,6 +197,23 @@ CongestionController::CongestionController(
 
 CongestionController::~CongestionController() {}
 
+void CongestionController::OnReceivedPacket(int64_t arrival_time_ms,
+                                            size_t payload_size,
+                                            const RTPHeader& header) {
+  // Send-side BWE.
+  if (header.extension.hasTransportSequenceNumber) {
+    remote_estimator_proxy_.IncomingPacket(arrival_time_ms, payload_size,
+                                           header);
+    return;
+  }
+
+  // Receive-side BWE.
+  if (remote_bitrate_estimator_) {
+    remote_bitrate_estimator_->IncomingPacket(arrival_time_ms, payload_size,
+                                              header);
+  }
+}
+
 void CongestionController::SetBweBitrates(int min_bitrate_bps,
                                           int start_bitrate_bps,
                                           int max_bitrate_bps) {