Add original_path_id to SerializedPacket and OnPacketSent. No functional change expected.

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 150 matching lines @@
 // Interface which gets callbacks from the QuicConnection at interesting
 // points.  Implementations must not mutate the state of the connection
 // as a result of these callbacks.
 class NET_EXPORT_PRIVATE QuicConnectionDebugVisitor
     : public QuicSentPacketManager::DebugDelegate {
  public:
   ~QuicConnectionDebugVisitor() override {}
 
   // Called when a packet has been sent.
   virtual void OnPacketSent(const SerializedPacket& serialized_packet,
+                            QuicPathId original_path_id,
                             QuicPacketNumber original_packet_number,
                             TransmissionType transmission_type,
                             QuicTime sent_time) {}
 
   // Called when a packet has been received, but before it is
   // validated or parsed.
   virtual void OnPacketReceived(const IPEndPoint& self_address,
                                 const IPEndPoint& peer_address,
                                 const QuicEncryptedPacket& packet) {}
 
@@ skipping 875 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_