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

net/quic/core/congestion_control/tcp_cubic_sender_packets.cc

Index: net/quic/core/congestion_control/tcp_cubic_sender_packets.cc
diff --git a/net/quic/core/congestion_control/tcp_cubic_sender_packets.cc b/net/quic/core/congestion_control/tcp_cubic_sender_packets.cc
index aa99b9bf73c2e712e67d52d9ac3c82ecfc542952..ce3518926299c421052090164886540a30683850 100644
--- a/net/quic/core/congestion_control/tcp_cubic_sender_packets.cc
+++ b/net/quic/core/congestion_control/tcp_cubic_sender_packets.cc
@@ -154,7 +154,8 @@ QuicByteCount TcpCubicSenderPackets::GetSlowStartThreshold() const {
 void TcpCubicSenderPackets::MaybeIncreaseCwnd(
     QuicPacketNumber acked_packet_number,
     QuicByteCount /*acked_bytes*/,
-    QuicByteCount prior_in_flight) {
+    QuicByteCount prior_in_flight,
+    QuicTime event_time) {
   QUIC_BUG_IF(InRecovery()) << "Never increase the CWND during recovery.";
   // Do not increase the congestion window unless the sender is close to using
   // the current window.
@@ -189,8 +190,8 @@ void TcpCubicSenderPackets::MaybeIncreaseCwnd(
   } else {
     congestion_window_ =
         std::min(max_tcp_congestion_window_,
-                 cubic_.CongestionWindowAfterAck(congestion_window_,
-                                                 rtt_stats_->min_rtt()));
+                 cubic_.CongestionWindowAfterAck(
+                     congestion_window_, rtt_stats_->min_rtt(), event_time));
     DVLOG(1) << "Cubic; congestion window: " << congestion_window_
              << " slowstart threshold: " << slowstart_threshold_;
   }