Always send queued retransmission packets, because of write blocked socket, once the socket gets un…

net/quic/quic_sent_packet_manager.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_sent_packet_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 547 matching lines @@
     QuicTime sent_time,
     TransmissionType transmission_type,
     HasRetransmittableData has_retransmittable_data) {
   QuicPacketNumber packet_number = serialized_packet->packet_number;
   DCHECK_LT(0u, packet_number);
   DCHECK(!unacked_packets_.IsUnacked(packet_number));
   QUIC_BUG_IF(serialized_packet->encrypted_length == 0)
       << "Cannot send empty packets.";
 
   if (delegate_ == nullptr && original_packet_number != 0) {
-    if (!pending_retransmissions_.erase(original_packet_number)) {
+    if (!pending_retransmissions_.erase(original_packet_number) &&
+        !FLAGS_quic_always_write_queued_retransmissions) {
       QUIC_BUG << "Expected packet number to be in "
                << "pending_retransmissions_.  packet_number: "
                << original_packet_number;
     }
   }
 
   if (pending_timer_transmission_count_ > 0) {
     --pending_timer_transmission_count_;
   }
 
@@ skipping 423 matching lines @@
 TransmissionInfo* QuicSentPacketManager::GetMutableTransmissionInfo(
     QuicPacketNumber packet_number) {
   return unacked_packets_.GetMutableTransmissionInfo(packet_number);
 }
 
 void QuicSentPacketManager::RemoveObsoletePackets() {
   unacked_packets_.RemoveObsoletePackets();
 }
 
 }  // namespace net