Close the connection after 3RTOs if there are no open streams and the 3RTO

net/quic/core/crypto/crypto_protocol.h

Index: net/quic/core/crypto/crypto_protocol.h
diff --git a/net/quic/core/crypto/crypto_protocol.h b/net/quic/core/crypto/crypto_protocol.h
index 6e9a355f69753a21d9c9ed42212b5539f11c96c1..eef32f283652f44ec624a16bf2bd6f90bc414db6 100644
--- a/net/quic/core/crypto/crypto_protocol.h
+++ b/net/quic/core/crypto/crypto_protocol.h
@@ -111,6 +111,7 @@ const QuicTag kAKD4 = TAG('A', 'K', 'D', '4');   // Ack decimation with 1/8 RTT
 const QuicTag kSSLR = TAG('S', 'S', 'L', 'R');   // Slow Start Large Reduction.
 const QuicTag kNPRR = TAG('N', 'P', 'R', 'R');   // Pace at unity instead of PRR
 const QuicTag k5RTO = TAG('5', 'R', 'T', 'O');   // Close connection on 5 RTOs
+const QuicTag k3RTO = TAG('3', 'R', 'T', 'O');   // Close connection on 3 RTOs
 const QuicTag kCTIM = TAG('C', 'T', 'I', 'M');   // Client timestamp in seconds
                                                  // since UNIX epoch.
 const QuicTag kDHDT = TAG('D', 'H', 'D', 'T');   // Disable HPACK dynamic table.