Early connection migration in QUIC.

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 114 matching lines @@
 
   // Called when a blocked socket becomes writable.
   virtual void OnCanWrite() = 0;
 
   // Called when the connection experiences a change in congestion window.
   virtual void OnCongestionWindowChange(QuicTime now) = 0;
 
   // Called when the connection receives a packet from a migrated client.
   virtual void OnConnectionMigration() = 0;
 
+  // Called when the the peer seems unreachable over the current network.
+  virtual void MaybeMigrateConnection() = 0;

[Ryan Hamilton, 2016/02/02 04:19:59]

I think OnPeerUnreachable() (or some such) would be a better name for this
method.

[Ryan Hamilton, 2016/02/02 04:19:59]

Looks like this is basically shared code and should probably be landed in an
internal change first.

[Jana, 2016/02/02 06:53:53]

Addressing in shared code.

[Jana, 2016/02/02 06:53:53]

Yes, I wanted to have this CL out for context. 

+
   // Called to ask if the visitor wants to schedule write resumption as it both
   // has pending data to write, and is able to write (e.g. based on flow control
   // limits).
   // Writes may be pending because they were write-blocked, congestion-throttled
   // or yielded to other connections.
   virtual bool WillingAndAbleToWrite() const = 0;
 
   // Called to ask if any handshake messages are pending in this visitor.
   virtual bool HasPendingHandshake() const = 0;
 
@@ skipping 869 matching lines @@
 
   // If true, multipath is enabled for this connection.
   bool multipath_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnection);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_H_