Stub for BBRv2, based on TCP congestion feedback frames.

net/quic/congestion_control/send_algorithm_interface.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 pure virtual class for send side congestion control algorithm.
 
 #ifndef NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_
 #define NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_
 
 #include <algorithm>
@@ skipping 33 matching lines @@
   // Indicates an update to the congestion state, caused either by an incoming
   // ack or loss event timeout.  |rtt_updated| indicates whether a new
   // latest_rtt sample has been taken, |byte_in_flight| the bytes in flight
   // prior to the congestion event.  |acked_packets| and |lost_packets| are
   // any packets considered acked or lost as a result of the congestion event.
   virtual void OnCongestionEvent(bool rtt_updated,
                                  QuicByteCount bytes_in_flight,
                                  const CongestionMap& acked_packets,
                                  const CongestionMap& lost_packets) = 0;
 
-  // Inform that we sent x bytes to the wire, and if that was a retransmission.
-  // Returns true if the packet should be tracked by the congestion manager,
-  // false otherwise. This is used by implementations such as tcp_cubic_sender
-  // that do not count outgoing ACK packets against the congestion window.
+  // Inform that we sent |bytes| to the wire, and if the packet is
+  // retransmittable. Returns true if the packet should be tracked by the
+  // congestion manager and included in bytes_in_flight, false otherwise.
+  // |bytes_in_flight| is the number of bytes in flight before the packet was
+  // sent.
   // Note: this function must be called for every packet sent to the wire.
   virtual bool OnPacketSent(QuicTime sent_time,
                             QuicByteCount bytes_in_flight,
                             QuicPacketSequenceNumber sequence_number,
                             QuicByteCount bytes,
                             HasRetransmittableData is_retransmittable) = 0;
 
   // Called when the retransmission timeout fires.  Neither OnPacketAbandoned
   // nor OnPacketLost will be called for these packets.
   virtual void OnRetransmissionTimeout(bool packets_retransmitted) = 0;
@@ skipping 15 matching lines @@
 
   // Returns the size of the current congestion window in bytes.  Note, this is
   // not the *available* window.  Some send algorithms may not use a congestion
   // window and will return 0.
   virtual QuicByteCount GetCongestionWindow() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_