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 <map>
@@ skipping 59 matching lines @@
       QuicTime now,
       Retransmission is_retransmission,
       HasRetransmittableData has_retransmittable_data) = 0;
 
   // What's the current estimated bandwidth in bytes per second.
   // Returns 0 when it does not have an estimate.
   virtual QuicBandwidth BandwidthEstimate() = 0;
 
   // TODO(satyamshekhar): Monitor MinRtt.
   virtual QuicTime::Delta SmoothedRtt() = 0;
+
+  // Get the send algorithm specific retransmission delay, called RTO in TCP,
+  // Note 1: the caller is responsible for sanity checking this value.
+  // Note 2: this will return zero if we don't have enough data for an estimate.
+  virtual QuicTime::Delta RetransmissionDelay() = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_INTERFACE_H_