Change the QUIC TLP to send new data instead of retransmitting old data

net/quic/quic_sent_packet_manager.h

 // Copyright 2013 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_QUIC_SENT_PACKET_MANAGER_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 83 matching lines @@
   // Processes the incoming ack.
   void OnIncomingAck(const ReceivedPacketInfo& received_info,
                      QuicTime ack_receive_time);
 
   // Returns true if the non-FEC packet |sequence_number| is unacked.
   bool IsUnacked(QuicPacketSequenceNumber sequence_number) const;
 
   // Requests retransmission of all unacked packets of |retransmission_type|.
   void RetransmitUnackedPackets(RetransmissionType retransmission_type);
 
+  // Retransmits the oldest pending packet there is still a tail loss probe
+  // pending.  Invoked after OnRetransmissionTimeout.
+  bool MaybeRetransmitTailLossProbe();
+
   // Removes the retransmittable frames from all unencrypted packets to ensure
   // they don't get retransmitted.
   void NeuterUnencryptedPackets();
 
   // Returns true if the unacked packet |sequence_number| has retransmittable
   // frames.  This will only return false if the packet has been acked, if a
   // previous transmission of this packet was ACK'd, or if this packet has been
   // retransmitted as with different sequence number.
   bool HasRetransmittableFrames(QuicPacketSequenceNumber sequence_number) const;
 
@@ skipping 85 matching lines @@
 
   // Process the incoming ack looking for newly ack'd data packets.
   void HandleAckForSentPackets(const ReceivedPacketInfo& received_info);
 
   // Returns the current retransmission mode.
   RetransmissionTimeoutMode GetRetransmissionMode() const;
 
   // Retransmits all crypto stream packets.
   void RetransmitCryptoPackets();
 
-  // Retransmits the oldest pending packet.
-  void RetransmitOldestPacket();
-
   // Retransmits all the packets and abandons by invoking a full RTO.
   void RetransmitAllPackets();
 
   // Returns the timer for retransmitting crypto handshake packets.
   const QuicTime::Delta GetCryptoRetransmissionDelay() const;
 
   // Returns the timer for a new tail loss probe.
   const QuicTime::Delta GetTailLossProbeDelay() const;
 
   // Returns the retransmission timeout, after which a full RTO occurs.
@@ skipping 83 matching lines @@
   // Sets of packets acked and lost as a result of the last congestion event.
   SendAlgorithmInterface::CongestionMap packets_acked_;
   SendAlgorithmInterface::CongestionMap packets_lost_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManager);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_