Log the certificate subjects from the server certificate sent via QUIC.

net/quic/quic_connection_logger.h

Index: net/quic/quic_connection_logger.h
diff --git a/net/quic/quic_connection_logger.h b/net/quic/quic_connection_logger.h
index 2110f9ef6d3bdcedf654dc375cd2341134b696ab..d020a61c707ffd61c4bdf8b85d84b28ae9ce5c10 100644
--- a/net/quic/quic_connection_logger.h
+++ b/net/quic/quic_connection_logger.h
@@ -16,6 +16,7 @@
 namespace net {
 
 class CryptoHandshakeMessage;
+class CertVerifyResult;
 
 // This class is a debug visitor of a QuicConnection which logs
 // events to |net_log|.
@@ -71,6 +72,7 @@ class NET_EXPORT_PRIVATE QuicConnectionLogger
   void UpdateReceivedFrameCounts(QuicStreamId stream_id,
                                  int num_frames_received,
                                  int num_duplicate_frames_received);
+  void OnCertificateVerified(const CertVerifyResult& result);
 
  private:
   // Do a factory get for a histogram for recording data, about individual