Log 0-RTT rejection in net log.

Change-Id: I8a03f403342f90340224eddfaa12b04a47e9ff75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364955
Auto-Submit: Renjie Tang <renjietang@chromium.org>
Reviewed-by: David Schinazi <dschinazi@chromium.org>
Commit-Queue: Renjie Tang <renjietang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799962}

net/log/net_log_event_type_list.h

@@ -2037,6 +2037,9 @@ EVENT_TYPE(QUIC_SESSION_TRANSPORT_PARAMETERS_SENT)
 //   }
 EVENT_TYPE(QUIC_SESSION_TRANSPORT_PARAMETERS_RESUMED)
 
+// QUIC with TLS gets 0-RTT rejected.
+EVENT_TYPE(QUIC_SESSION_ZERO_RTT_REJECTED)
+
 // A QUIC connection received a PUSH_PROMISE frame.  The following
 // parameters are attached:
 //   {

net/quic/quic_connection_logger.cc

@@ -589,6 +589,10 @@ void QuicConnectionLogger::OnTransportParametersResumed(
   event_logger_.OnTransportParametersResumed(transport_parameters);
 }
 
+void QuicConnectionLogger::OnZeroRttRejected() {
+  event_logger_.OnZeroRttRejected();
+}
+
 void QuicConnectionLogger::RecordAggregatePacketLossRate() const {
   // For short connections under 22 packets in length, we'll rely on the
   // Net.QuicSession.21CumulativePacketsReceived_* histogram to indicate packet

net/quic/quic_connection_logger.h

@@ -129,6 +129,8 @@ class NET_EXPORT_PRIVATE QuicConnectionLogger
   // Returns connection's overall packet loss rate in fraction.
   float ReceivedPacketLossRate() const;
 
+  void OnZeroRttRejected() override;
+
  private:
   // Do a factory get for a histogram to record a 6-packet loss-sequence as a
   // sample. The histogram will record the 64 distinct possible combinations.

net/quic/quic_event_logger.cc

@@ -870,4 +870,10 @@ void QuicEventLogger::OnTransportParametersResumed(
       });
 }
 
+void QuicEventLogger::OnZeroRttRejected() {
+  if (!net_log_.IsCapturing())
+    return;
+  net_log_.AddEvent(NetLogEventType::QUIC_SESSION_ZERO_RTT_REJECTED);
+}
+
 }  // namespace net

net/quic/quic_event_logger.h

@@ -94,6 +94,7 @@ class NET_EXPORT_PRIVATE QuicEventLogger
       const quic::TransportParameters& transport_parameters) override;
   void OnTransportParametersResumed(
       const quic::TransportParameters& transport_parameters) override;
+  void OnZeroRttRejected() override;
 
   // Events that are not received via the visitor and have to be called manually
   // from the session.