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

net/quic/congestion_control/send_algorithm_interface.h

 // Copyright (c) 2012 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.
 //
 // The pure virtual class for send side congestion control algorithm.
 
 #ifndef NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_
 #define NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_
 
 #include <algorithm>
@@ skipping 57 matching lines @@
   virtual bool OnPacketSent(QuicTime sent_time,
                             QuicByteCount bytes_in_flight,
                             QuicPacketNumber packet_number,
                             QuicByteCount bytes,
                             HasRetransmittableData is_retransmittable) = 0;
 
   // Called when the retransmission timeout fires.  Neither OnPacketAbandoned
   // nor OnPacketLost will be called for these packets.
   virtual void OnRetransmissionTimeout(bool packets_retransmitted) = 0;
 
+  // Called when connection migrates and cwnd needs to be reset.
+  virtual void OnConnectionMigration() = 0;
+
   // Calculate the time until we can send the next packet.
   virtual QuicTime::Delta TimeUntilSend(
       QuicTime now,
       QuicByteCount bytes_in_flight,
       HasRetransmittableData has_retransmittable_data) const = 0;
 
   // The pacing rate of the send algorithm.  May be zero if the rate is unknown.
   virtual QuicBandwidth PacingRate() const = 0;
 
   // What's the current estimated bandwidth in bytes per second.
@@ skipping 27 matching lines @@
   // Called by the Session when we get a bandwidth estimate from the client.
   // Uses the max bandwidth in the params if |max_bandwidth_resumption| is true.
   virtual void ResumeConnectionState(
       const CachedNetworkParameters& cached_network_params,
       bool max_bandwidth_resumption) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_