Add new histograms to confirm that PINGs are outstanding when a QUIC connection times out with open…

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 c6699f189bace3a856695447723baebb27611843..91eb2ea2e53280811d5a08801105f3887556074f 100644
--- a/net/quic/quic_client_session.cc
+++ b/net/quic/quic_client_session.cc
@@ -602,7 +602,19 @@ void QuicClientSession::OnConnectionClosed(QuicErrorCode error,
     UMA_HISTOGRAM_COUNTS(
         "Net.QuicSession.ConnectionClose.NumOpenStreams.TimedOut",
         GetNumOpenStreams());
-    if (!IsCryptoHandshakeConfirmed()) {
+    if (IsCryptoHandshakeConfirmed()) {
+      if (GetNumOpenStreams() > 0) {
+        UMA_HISTOGRAM_BOOLEAN(
+            "Net.QuicSession.TimedOutWithOpenStreams.HasUnackedPackets",
+            connection()->sent_packet_manager().HasUnackedPackets());
+        UMA_HISTOGRAM_COUNTS(
+            "Net.QuicSession.TimedOutWithOpenStreams.ConsecutiveRTOCount",
+            connection()->sent_packet_manager().consecutive_rto_count());
+        UMA_HISTOGRAM_COUNTS(
+            "Net.QuicSession.TimedOutWithOpenStreams.ConsecutiveTLPCount",
+            connection()->sent_packet_manager().consecutive_tlp_count());
+      }
+    } else {
       UMA_HISTOGRAM_COUNTS(
           "Net.QuicSession.ConnectionClose.NumOpenStreams.HandshakeTimedOut",
           GetNumOpenStreams());