Add OnConnectionMigration method to QuicSentPacketManager. Add OnConnectionMigration interface to S…

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 917 matching lines @@
 
   // Set up a pacing sender with a 1 millisecond alarm granularity, the same as
   // the default granularity of the Linux kernel's FQ qdisc.
   using_pacing_ = true;
   send_algorithm_.reset(
       new PacingSender(send_algorithm_.release(),
                        QuicTime::Delta::FromMilliseconds(1),
                        kInitialUnpacedBurst));
 }
 
+void QuicSentPacketManager::OnConnectionMigration(PeerAddressChangeType type) {
+  if (type == UNKNOWN) {
+    return;
+  }
+
+  if (type == NAT_PORT_REBINDING || type == IPV4_SUBNET_REBINDING) {
+    // Rtt and cwnd do not need to be reset when the peer address change is
+    // considered to be caused by NATs.
+    return;
+  }
+
+  rtt_stats_.OnConnectionMigration();
+  send_algorithm_->OnConnectionMigration();
+}
+
 }  // namespace net