Limit QUIC's send algorithm max CWND by the peer's receive buffer and

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 0fbefecc180c825bdf960ba414e5b58a71fa0841..7b1f37d2acd96e6171e74e78888e6f0475c37770 100644
--- a/net/quic/congestion_control/send_algorithm_interface.h
+++ b/net/quic/congestion_control/send_algorithm_interface.h
@@ -47,6 +47,9 @@ class NET_EXPORT_PRIVATE SendAlgorithmInterface {
   // particularly for congestion avoidance.  Can be set any time.
   virtual void SetNumEmulatedConnections(int num_connections) = 0;
 
+  // Sets the maximum congestion window in bytes.
+  virtual void SetMaxCongestionWindow(QuicByteCount max_congestion_window) = 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