Land Recent QUIC changes.

net/quic/congestion_control/send_algorithm_interface.h

Index: net/quic/congestion_control/send_algorithm_interface.h
diff --git a/net/quic/congestion_control/send_algorithm_interface.h b/net/quic/congestion_control/send_algorithm_interface.h
index b0b4cacea525d442d3da135c60c2ff42bd4928c9..8ff39611f08c04e5c15d4b022edab90cee065b86 100644
--- a/net/quic/congestion_control/send_algorithm_interface.h
+++ b/net/quic/congestion_control/send_algorithm_interface.h
@@ -87,6 +87,14 @@ class NET_EXPORT_PRIVATE SendAlgorithmInterface {
   // 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;
+
+  // Returns the size of the current congestion window.  Note, this
+  // is not the *available* window.  Some send algorithms may not use a
+  // congestion window and will return 0.
+  virtual QuicByteCount GetCongestionWindow() = 0;
+
+  // Sets the value of the current congestion window to |window|.
+  virtual void SetCongestionWindow(QuicByteCount window) = 0;
 };
 
 }  // namespace net