relnote: Use event_time instead of ApproximateNow() in QUIC cubic code. Protected by --quic_use_eve…

net/quic/core/congestion_control/tcp_cubic_sender_base.cc

Index: net/quic/core/congestion_control/tcp_cubic_sender_base.cc
diff --git a/net/quic/core/congestion_control/tcp_cubic_sender_base.cc b/net/quic/core/congestion_control/tcp_cubic_sender_base.cc
index 069bb161c86f3380049a8a382c6709072f61f98c..c8d89309490d1b55072b87854b3abc9550369bb7 100644
--- a/net/quic/core/congestion_control/tcp_cubic_sender_base.cc
+++ b/net/quic/core/congestion_control/tcp_cubic_sender_base.cc
@@ -123,7 +123,7 @@ float TcpCubicSenderBase::RenoBeta() const {
 void TcpCubicSenderBase::OnCongestionEvent(
     bool rtt_updated,
     QuicByteCount prior_in_flight,
-    QuicTime /*event_time*/,
+    QuicTime event_time,
     const CongestionVector& acked_packets,
     const CongestionVector& lost_packets) {
   if (rtt_updated && InSlowStart() &&
@@ -138,13 +138,14 @@ void TcpCubicSenderBase::OnCongestionEvent(
   }
   for (CongestionVector::const_iterator it = acked_packets.begin();
        it != acked_packets.end(); ++it) {
-    OnPacketAcked(it->first, it->second, prior_in_flight);
+    OnPacketAcked(it->first, it->second, prior_in_flight, event_time);
   }
 }
 
 void TcpCubicSenderBase::OnPacketAcked(QuicPacketNumber acked_packet_number,
                                        QuicByteCount acked_bytes,
-                                       QuicByteCount prior_in_flight) {
+                                       QuicByteCount prior_in_flight,
+                                       QuicTime event_time) {
   largest_acked_packet_number_ =
       std::max(acked_packet_number, largest_acked_packet_number_);
   if (InRecovery()) {
@@ -154,7 +155,8 @@ void TcpCubicSenderBase::OnPacketAcked(QuicPacketNumber acked_packet_number,
     }
     return;
   }
-  MaybeIncreaseCwnd(acked_packet_number, acked_bytes, prior_in_flight);
+  MaybeIncreaseCwnd(acked_packet_number, acked_bytes, prior_in_flight,
+                    event_time);
   if (InSlowStart()) {
     hybrid_slow_start_.OnPacketAcked(acked_packet_number);
   }