Add a new rate based sending connection option which uses the pacing rate to keep the bytes_in_flig…

net/quic/congestion_control/pacing_sender.h

 // Copyright (c) 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.
 //
 // A send algorithm that adds pacing on top of an another send algorithm.
 // It uses the underlying sender's pacing rate to schedule packets.
 // It also takes into consideration the expected granularity of the underlying
 // alarm to ensure that alarms are not set too aggressively, and err towards
 // sending packets too early instead of too late.
 
@@ skipping 41 matching lines @@
                          const CongestionVector& lost_packets) override;
   bool OnPacketSent(QuicTime sent_time,
                     QuicByteCount bytes_in_flight,
                     QuicPacketNumber packet_number,
                     QuicByteCount bytes,
                     HasRetransmittableData is_retransmittable) override;
   void OnRetransmissionTimeout(bool packets_retransmitted) override;
   void OnConnectionMigration() override;
   QuicTime::Delta TimeUntilSend(QuicTime now,
                                 QuicByteCount bytes_in_flight) const override;
-  QuicBandwidth PacingRate() const override;
+  QuicBandwidth PacingRate(QuicByteCount bytes_in_flight) const override;
   QuicBandwidth BandwidthEstimate() const override;
   QuicTime::Delta RetransmissionDelay() const override;
   QuicByteCount GetCongestionWindow() const override;
   bool InSlowStart() const override;
   bool InRecovery() const override;
   QuicByteCount GetSlowStartThreshold() const override;
   CongestionControlType GetCongestionControlType() const override;
   // End implementation of SendAlgorithmInterface.
 
  private:
@@ skipping 12 matching lines @@
   QuicTime last_delayed_packet_sent_time_;
   QuicTime ideal_next_packet_send_time_;  // When can the next packet be sent.
   mutable bool was_last_send_delayed_;  // True when the last send was delayed.
 
   DISALLOW_COPY_AND_ASSIGN(PacingSender);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_