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

net/quic/quic_sent_packet_manager.h

Index: net/quic/quic_sent_packet_manager.h
diff --git a/net/quic/quic_sent_packet_manager.h b/net/quic/quic_sent_packet_manager.h
index 3ace0143c1c81c6cfcdd8eee495353aeea1eb7af..d0e533c7eedcc9f8cbaa39494a45b445c4e7d209 100644
--- a/net/quic/quic_sent_packet_manager.h
+++ b/net/quic/quic_sent_packet_manager.h
@@ -230,6 +230,14 @@ class NET_EXPORT_PRIVATE QuicSentPacketManager {
     network_change_visitor_ = visitor;
   }
 
+  size_t consecutive_rto_count() const {
+    return consecutive_rto_count_;
+  }
+
+  size_t consecutive_tlp_count() const {
+    return consecutive_tlp_count_;
+  }
+
  private:
   friend class test::QuicConnectionPeer;
   friend class test::QuicSentPacketManagerPeer;