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

net/quic/quic_sent_packet_manager.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 212 matching lines @@
   QuicPacketSequenceNumber largest_observed() const {
     return largest_observed_;
   }
 
   void set_network_change_visitor(NetworkChangeVisitor* visitor) {
     DCHECK(!network_change_visitor_);
     DCHECK(visitor);
     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;
 
   // The retransmission timer is a single timer which switches modes depending
   // upon connection state.
   enum RetransmissionTimeoutMode {
     // A conventional TCP style RTO.
     RTO_MODE,
     // A tail loss probe.  By default, QUIC sends up to two before RTOing.
@@ skipping 126 matching lines @@
   // the crypto stream (i.e. SCUP messages) are treated like normal
   // retransmittable frames.
   bool handshake_confirmed_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManager);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_