Adding histogram to count number of RTTs for handshake when confirmation is required.

net/quic/quic_client_session.cc

Index: net/quic/quic_client_session.cc
diff --git a/net/quic/quic_client_session.cc b/net/quic/quic_client_session.cc
index d5639738969f8f8250c00cd73b10c6ceff1fcbbe..ab8fd75e16b154fae308a967a9a107d98648db88 100644
--- a/net/quic/quic_client_session.cc
+++ b/net/quic/quic_client_session.cc
@@ -239,6 +239,11 @@ QuicClientSession::~QuicClientSession() {
     } else {
       UMA_HISTOGRAM_CUSTOM_COUNTS("Net.QuicSession.ConnectRandomPortForHTTP",
                                   round_trip_handshakes, 0, 3, 4);
+      if (require_confirmation_) {
+        UMA_HISTOGRAM_CUSTOM_COUNTS(
+            "Net.QuicSession.ConnectRandomPortRequiringConfirmationForHTTP",
+            round_trip_handshakes, 0, 3, 4);
+      }
     }
   } else {
     if (port_selected) {
@@ -247,6 +252,11 @@ QuicClientSession::~QuicClientSession() {
     } else {
       UMA_HISTOGRAM_CUSTOM_COUNTS("Net.QuicSession.ConnectRandomPortForHTTPS",
                                   round_trip_handshakes, 0, 3, 4);
+      if (require_confirmation_) {
+        UMA_HISTOGRAM_CUSTOM_COUNTS(
+            "Net.QuicSession.ConnectRandomPortRequiringConfirmationForHTTPS",
+            round_trip_handshakes, 0, 3, 4);
+      }
     }
   }
   const QuicConnectionStats stats = connection()->GetStats();