Allow QuicConnection to own its QuicPacketWriter

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 205 matching lines @@
     CONNECTION_CLOSE
   };
 
   enum AckBundling {
     NO_ACK = 0,
     SEND_ACK = 1,
     BUNDLE_PENDING_ACK = 2,
   };
 
   // Constructs a new QuicConnection for |connection_id| and |address|.
-  // |helper| and |writer| must outlive this connection.
+  // |helper| must outlive this connection, and if |owns_writer| is false, so
+  // must |writer|.
   QuicConnection(QuicConnectionId connection_id,
                  IPEndPoint address,
                  QuicConnectionHelperInterface* helper,
                  QuicPacketWriter* writer,
+                 bool owns_writer,
                  bool is_server,
                  const QuicVersionVector& supported_versions);
   virtual ~QuicConnection();
 
   // Sets connection parameters from the supplied |config|.
   void SetFromConfig(const QuicConfig& config);
 
   // Send the data in |data| to the peer in as few packets as possible.
   // Returns a pair with the number of bytes consumed from data, and a boolean
   // indicating if the fin bit was consumed.  This does not indicate the data
@@ skipping 384 matching lines @@
   // Sets the ping alarm to the appropriate value, if any.
   void SetPingAlarm();
 
   // On arrival of a new packet, checks to see if the socket addresses have
   // changed since the last packet we saw on this connection.
   void CheckForAddressMigration(const IPEndPoint& self_address,
                                 const IPEndPoint& peer_address);
 
   QuicFramer framer_;
   QuicConnectionHelperInterface* helper_;  // Not owned.
-  QuicPacketWriter* writer_;  // Not owned.
+  QuicPacketWriter* writer_;  // Owned or not depending on |owns_writer_|.
+  bool owns_writer_;
   EncryptionLevel encryption_level_;
   const QuicClock* clock_;
   QuicRandom* random_generator_;
 
   const QuicConnectionId connection_id_;
   // Address on the last successfully processed packet received from the
   // client.
   IPEndPoint self_address_;
   IPEndPoint peer_address_;
   // Used to store latest peer port to possibly migrate to later.
@@ skipping 127 matching lines @@
   // If non-empty this contains the set of versions received in a
   // version negotiation packet.
   QuicVersionVector server_supported_versions_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnection);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_H_