Update from chromium https://crrev.com/302282

net/quic/congestion_control/tcp_cubic_sender.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.
 //
 // TCP cubic send side congestion algorithm, emulates the behavior of
 // TCP cubic.
 
 #ifndef NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_
 #define NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "net/base/net_export.h"
 #include "net/quic/congestion_control/cubic.h"
 #include "net/quic/congestion_control/hybrid_slow_start.h"
+#include "net/quic/congestion_control/prr_sender.h"
 #include "net/quic/congestion_control/send_algorithm_interface.h"
 #include "net/quic/quic_bandwidth.h"
 #include "net/quic/quic_connection_stats.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_time.h"
 
 namespace net {
 
 class RttStats;
 
 namespace test {
 class TcpCubicSenderPeer;
 }  // namespace test
 
 class NET_EXPORT_PRIVATE TcpCubicSender : public SendAlgorithmInterface {
  public:
   // Reno option and max_tcp_congestion_window are provided for testing.
   TcpCubicSender(const QuicClock* clock,
                  const RttStats* rtt_stats,
                  bool reno,
-                 QuicTcpCongestionWindow max_tcp_congestion_window,
+                 QuicPacketCount max_tcp_congestion_window,
                  QuicConnectionStats* stats);
   ~TcpCubicSender() override;
 
   // Start implementation of SendAlgorithmInterface.
   void SetFromConfig(const QuicConfig& config, bool is_server) override;
   void SetNumEmulatedConnections(int num_connections) override;
-  void OnIncomingQuicCongestionFeedbackFrame(
-      const QuicCongestionFeedbackFrame& feedback,
-      QuicTime feedback_receive_time) override;
   void OnCongestionEvent(bool rtt_updated,
                          QuicByteCount bytes_in_flight,
                          const CongestionVector& acked_packets,
                          const CongestionVector& lost_packets) override;
   bool OnPacketSent(QuicTime sent_time,
                     QuicByteCount bytes_in_flight,
                     QuicPacketSequenceNumber sequence_number,
                     QuicByteCount bytes,
                     HasRetransmittableData is_retransmittable) override;
   void OnRetransmissionTimeout(bool packets_retransmitted) override;
@@ skipping 16 matching lines @@
  private:
   friend class test::TcpCubicSenderPeer;
 
   // TODO(ianswett): Remove these and migrate to OnCongestionEvent.
   void OnPacketAcked(QuicPacketSequenceNumber acked_sequence_number,
                      QuicByteCount acked_bytes,
                      QuicByteCount bytes_in_flight);
   void OnPacketLost(QuicPacketSequenceNumber largest_loss,
                     QuicByteCount bytes_in_flight);
 
-  QuicByteCount SendWindow() const;
   void MaybeIncreaseCwnd(QuicPacketSequenceNumber acked_sequence_number,
                          QuicByteCount bytes_in_flight);
   bool IsCwndLimited(QuicByteCount bytes_in_flight) const;
-  // Methods for isolating PRR from the rest of TCP Cubic.
-  void PrrOnPacketLost(QuicByteCount bytes_in_flight);
-  void PrrOnPacketAcked(QuicByteCount acked_bytes);
-  QuicTime::Delta PrrTimeUntilSend(QuicByteCount bytes_in_flight) const;
-
 
   HybridSlowStart hybrid_slow_start_;
   Cubic cubic_;
+  PrrSender prr_;
   const RttStats* rtt_stats_;
   QuicConnectionStats* stats_;
 
   // If true, Reno congestion control is used instead of Cubic.
   const bool reno_;
 
   // Number of connections to simulate.
-  int num_connections_;
+  uint32 num_connections_;
 
   // ACK counter for the Reno implementation.
-  int64 congestion_window_count_;
-
-  // Receiver side advertised window.
-  QuicByteCount receive_window_;
-
-  // Bytes sent and acked since the last loss event.  Used for PRR.
-  QuicByteCount prr_out_;
-  QuicByteCount prr_delivered_;
-  size_t ack_count_since_loss_;
-
-  // The congestion window before the last loss event.
-  QuicByteCount bytes_in_flight_before_loss_;
+  uint64 congestion_window_count_;
 
   // Track the largest packet that has been sent.
   QuicPacketSequenceNumber largest_sent_sequence_number_;
 
   // Track the largest packet that has been acked.
   QuicPacketSequenceNumber largest_acked_sequence_number_;
 
   // Track the largest sequence number outstanding when a CWND cutback occurs.
   QuicPacketSequenceNumber largest_sent_at_last_cutback_;
 
   // Congestion window in packets.
-  QuicTcpCongestionWindow congestion_window_;
+  QuicPacketCount congestion_window_;
 
   // Congestion window before the last loss event or RTO.
   QuicByteCount previous_congestion_window_;
 
   // Slow start congestion window in packets, aka ssthresh.
-  QuicTcpCongestionWindow slowstart_threshold_;
+  QuicPacketCount slowstart_threshold_;
 
   // Slow start threshold before the last loss event or RTO.
-  QuicTcpCongestionWindow previous_slowstart_threshold_;
+  QuicPacketCount previous_slowstart_threshold_;
 
   // Whether the last loss event caused us to exit slowstart.
   // Used for stats collection of slowstart_packets_lost
   bool last_cutback_exited_slowstart_;
 
   // Maximum number of outstanding packets for tcp.
-  QuicTcpCongestionWindow max_tcp_congestion_window_;
+  QuicPacketCount max_tcp_congestion_window_;
 
   DISALLOW_COPY_AND_ASSIGN(TcpCubicSender);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_