Change the QUIC TLP to send new data instead of retransmitting old data

net/quic/quic_connection_test.cc

Index: net/quic/quic_connection_test.cc
diff --git a/net/quic/quic_connection_test.cc b/net/quic/quic_connection_test.cc
index b3b661aae023e629565e280418a90aaf532eee8c..ff50b01010615909a57b43f97e0e5b34e2cf678b 100644
--- a/net/quic/quic_connection_test.cc
+++ b/net/quic/quic_connection_test.cc
@@ -2224,6 +2224,27 @@ TEST_P(QuicConnectionTest, ReviveMissingPacketAfterDataPackets) {
   EXPECT_NE(0u, QuicConnectionPeer::ReceivedEntropyHash(&connection_, 3));
 }
 
+TEST_P(QuicConnectionTest, TLP) {
+  QuicSentPacketManagerPeer::SetMaxTailLossProbes(
+      QuicConnectionPeer::GetSentPacketManager(&connection_), 1);
+
+  SendStreamDataToPeer(3, "foo", 0, !kFin, NULL);
+  EXPECT_EQ(1u, outgoing_ack()->sent_info.least_unacked);
+  QuicTime retransmission_time =
+      connection_.GetRetransmissionAlarm()->deadline();
+  EXPECT_NE(QuicTime::Zero(), retransmission_time);
+
+  EXPECT_EQ(1u, writer_->header().packet_sequence_number);
+  // Simulate the retransmission alarm firing and sending a tlp,
+  // so send algorithm's OnRetransmissionTimeout is not called.
+  clock_.AdvanceTime(retransmission_time.Subtract(clock_.Now()));
+  EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, 2u, _, _));
+  connection_.GetRetransmissionAlarm()->Fire();
+  EXPECT_EQ(2u, writer_->header().packet_sequence_number);
+  // We do not raise the high water mark yet.
+  EXPECT_EQ(1u, outgoing_ack()->sent_info.least_unacked);
+}
+
 TEST_P(QuicConnectionTest, RTO) {
   QuicTime default_retransmission_time = clock_.ApproximateNow().Add(
       DefaultRetransmissionTime());