On client address changes, only migrate QUIC connections when client address changes are considered…

net/quic/quic_connection.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 entity that handles framing writes for a Quic client or server.
 // Each QuicSession will have a connection associated with it.
 //
 // On the server side, the Dispatcher handles the raw reads, and hands off
 // packets via ProcessUdpPacket for framing and processing.
 //
@@ skipping 638 matching lines @@
   // safely done until the packet is validated.  Returns true if the packet
   // can be handled, false otherwise.
   virtual bool ProcessValidatedPacket();
 
   // Send a packet to the peer, and takes ownership of the packet if the packet
   // cannot be written immediately.
   virtual void SendOrQueuePacket(QueuedPacket packet);
 
   QuicConnectionHelperInterface* helper() { return helper_; }
 
+  // On peer address changes, determine and return the change type.
+  virtual PeerAddressChangeType DeterminePeerAddressChangeType();
+
   // Selects and updates the version of the protocol being used by selecting a
   // version from |available_versions| which is also supported. Returns true if
   // such a version exists, false otherwise.
   bool SelectMutualVersion(const QuicVersionVector& available_versions);
 
   bool peer_ip_changed() const { return peer_ip_changed_; }
 
   bool peer_port_changed() const { return peer_port_changed_; }
 
+  const IPAddressNumber& migrating_peer_ip() const { return migrating_peer_ip_; }
+
  private:
   friend class test::QuicConnectionPeer;
   friend class test::PacketSavingConnection;
 
   typedef std::list<QueuedPacket> QueuedPacketList;
   typedef std::map<QuicFecGroupNumber, QuicFecGroup*> FecGroupMap;
 
   // Writes the given packet to socket, encrypted with packet's
   // encryption_level. Returns true on successful write, and false if the writer
   // was blocked and the write needs to be tried again. Notifies the
@@ skipping 293 matching lines @@
 
   // Whether a GoAway has been received.
   bool goaway_received_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnection);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_H_