Land Recent QUIC Changes.

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 20 matching lines @@
 
   static SendAlgorithmInterface* Create(const QuicClock* clock,
                                         const RttStats* rtt_stats,
                                         CongestionControlType type,
                                         QuicConnectionStats* stats);
 
   virtual ~SendAlgorithmInterface() {}
 
   virtual void SetFromConfig(const QuicConfig& config, bool is_server) = 0;
 
+  // Sets the number of connections to emulate when doing congestion control,
+  // particularly for congestion avoidance.  Can be set any time.
+  virtual void SetNumEmulatedConnections(int num_connections) = 0;
+
   // Called when we receive congestion feedback from remote peer.
   virtual void OnIncomingQuicCongestionFeedbackFrame(
       const QuicCongestionFeedbackFrame& feedback,
       QuicTime feedback_receive_time) = 0;
 
   // 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.
@@ skipping 55 matching lines @@
   // aka ssthresh.  Some send algorithms do not define a slow start
   // threshold and will return 0.
   virtual QuicByteCount GetSlowStartThreshold() const = 0;
 
   virtual CongestionControlType GetCongestionControlType() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_