Repair the CWND reduction caused by spurious RTO's in QUIC's congestion

net/quic/quic_unacked_packet_map.cc

 // Copyright 2014 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_unacked_packet_map.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "net/quic/quic_connection_stats.h"
 #include "net/quic/quic_utils_chromium.h"
@@ skipping 302 matching lines @@
 
   largest_sent_packet_ = max(sequence_number, largest_sent_packet_);
   it->second.sent_time = sent_time;
   if (set_in_flight) {
     bytes_in_flight_ += bytes_sent;
     it->second.bytes_sent = bytes_sent;
     it->second.in_flight = true;
   }
 }
 
+void QuicUnackedPacketMap::RestoreInFlight(
+    QuicPacketSequenceNumber sequence_number) {
+  DCHECK_LT(0u, sequence_number);
+  UnackedPacketMap::iterator it = unacked_packets_.find(sequence_number);
+  if (it == unacked_packets_.end()) {
+    LOG(DFATAL) << "OnPacketSent called for packet that is not unacked: "
+                << sequence_number;
+    return;
+  }
+  DCHECK(!it->second.in_flight);
+  DCHECK_NE(0u, it->second.bytes_sent);
+  DCHECK(it->second.sent_time.IsInitialized());
+
+  bytes_in_flight_ += it->second.bytes_sent;
+  it->second.in_flight = true;
+}
+
 }  // namespace net