Update from https://crrev.com/305340

net/quic/quic_client_session.cc

 // Copyright (c) 2012 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.
 
 #include "net/quic/quic_client_session.h"
 
 #include "base/callback_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
+#include "net/base/network_activity_monitor.h"
 #include "net/http/transport_security_state.h"
 #include "net/quic/crypto/proof_verifier_chromium.h"
 #include "net/quic/crypto/quic_server_info.h"
 #include "net/quic/quic_connection_helper.h"
 #include "net/quic/quic_crypto_client_stream_factory.h"
 #include "net/quic/quic_server_id.h"
 #include "net/quic/quic_stream_factory.h"
 #include "net/spdy/spdy_session.h"
 #include "net/ssl/channel_id_service.h"
 #include "net/ssl/ssl_connection_status_flags.h"
@@ skipping 600 matching lines @@
         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());
       }
+      if (connection()->sent_packet_manager().HasUnackedPackets()) {
+        UMA_HISTOGRAM_TIMES(
+            "Net.QuicSession.LocallyTimedOutWithOpenStreams."
+                "TimeSinceLastReceived.UnackedPackets",
+            NetworkActivityMonitor::GetInstance()->GetTimeSinceLastReceived());
+      } else {
+        UMA_HISTOGRAM_TIMES(
+            "Net.QuicSession.LocallyTimedOutWithOpenStreams."
+                "TimeSinceLastReceived.NoUnackedPackets",
+            NetworkActivityMonitor::GetInstance()->GetTimeSinceLastReceived());
+      }
+
     } else {
       UMA_HISTOGRAM_COUNTS(
           "Net.QuicSession.ConnectionClose.NumOpenStreams.HandshakeTimedOut",
           GetNumOpenStreams());
       UMA_HISTOGRAM_COUNTS(
           "Net.QuicSession.ConnectionClose.NumTotalStreams.HandshakeTimedOut",
           num_total_streams_);
     }
   }
 
@@ skipping 242 matching lines @@
     return;
 
   // TODO(rch): re-enable this code once beta is cut.
   //  if (stream_factory_)
   //    stream_factory_->OnSessionConnectTimeout(this);
   //  CloseAllStreams(ERR_QUIC_HANDSHAKE_FAILED);
   //  DCHECK_EQ(0u, GetNumOpenStreams());
 }
 
 }  // namespace net