relnote: Allow individual QUIC writers to limit the maximum packet size.

net/tools/quic/quic_simple_server_packet_writer.h

 // Copyright 2014 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.
 
 #ifndef NET_QUIC_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
 #define NET_QUIC_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 29 matching lines @@
       const IPAddressNumber& self_address,
       const IPEndPoint& peer_address,
       WriteCallback callback);
 
   void OnWriteComplete(int rv);
 
   // QuicPacketWriter implementation:
   bool IsWriteBlockedDataBuffered() const override;
   bool IsWriteBlocked() const override;
   void SetWritable() override;
+  QuicByteCount GetMaxPacketSize(const IPEndPoint& peer_address) const override;
 
  protected:
   // Do not call WritePacket on its own -- use WritePacketWithCallback
   WriteResult WritePacket(const char* buffer,
                           size_t buf_len,
                           const IPAddressNumber& self_address,
                           const IPEndPoint& peer_address) override;
 
  private:
   UDPServerSocket* socket_;
 
   // To be notified after every successful asynchronous write.
   QuicBlockedWriterInterface* blocked_writer_;
 
   // To call once the write completes.
   WriteCallback callback_;
 
   // Whether a write is currently in flight.
   bool write_blocked_;
 
   base::WeakPtrFactory<QuicSimpleServerPacketWriter> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSimpleServerPacketWriter);
 };
 
 }  // namespace tools
 }  // namespace net
 
 #endif  // NET_QUIC_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_