Changes QUIC's SentPacketManager to pass in HAS_RETRANSMITTABLE_DATA to

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index 7978fedc82c100361bc326d7b7fd61364ca45cfe..99b8bcf6897340bb5a2cee94985aaf4433679f97 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -323,6 +323,9 @@ void QuicSentPacketManager::RetransmitUnackedPackets(
         (retransmission_type == ALL_UNACKED_RETRANSMISSION ||
          frames->encryption_level() == ENCRYPTION_INITIAL)) {
       MarkForRetransmission(sequence_number, retransmission_type);
+    } else if (it->is_fec_packet) {
+      // Remove FEC packets from the packet map, since we can't retransmit them.
+      unacked_packets_.RemoveFromInFlight(sequence_number);
     }
   }
 }
@@ -549,12 +552,18 @@ bool QuicSentPacketManager::OnPacketSent(
   }
 
   // Only track packets as in flight that the send algorithm wants us to track.
+  // Since FEC packets should also be counted towards the congestion window,
+  // consider them as retransmittable for the purposes of congestion control.
+  HasRetransmittableData has_congestion_controlled_data =
+      serialized_packet->packet->is_fec_packet() ?
+      HAS_RETRANSMITTABLE_DATA : has_retransmittable_data;
   const bool in_flight =
       send_algorithm_->OnPacketSent(sent_time,
                                     unacked_packets_.bytes_in_flight(),
                                     sequence_number,
                                     bytes,
-                                    has_retransmittable_data);
+                                    has_congestion_controlled_data);
+
   unacked_packets_.AddSentPacket(*serialized_packet,
                                  original_sequence_number,
                                  transmission_type,