Instrumenting QUIC code to find jank in GetConnectionDescriptionString

net/quic/quic_connection_logger.cc

 // Copyright (c) 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.
 
 #include "net/quic/quic_connection_logger.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 266 matching lines @@
       NetworkChangeNotifier::GetConnectionType();
   const char* description = NetworkChangeNotifier::ConnectionTypeToString(type);
   // Most platforms don't distingish Wifi vs Etherenet, and call everything
   // CONNECTION_UNKNOWN :-(.  We'll tease out some details when we are on WiFi,
   // and hopefully leave only ethernet (with no WiFi available) in the
   // CONNECTION_UNKNOWN category.  This *might* err if there is both ethernet,
   // as well as WiFi, where WiFi was not being used that much.
   // This function only seems usefully defined on Windows currently.
   if (type == NetworkChangeNotifier::CONNECTION_UNKNOWN ||
       type == NetworkChangeNotifier::CONNECTION_WIFI) {
+    // TODO(rtenneti): Remove ScopedTracker below once crbug.com/422516 is
+    // fixed.
+    tracked_objects::ScopedTracker tracking_profile1(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION(
+            "422516 QuicConnectionLogger GetConnectionDescriptionString1"));
+
     WifiPHYLayerProtocol wifi_type = GetWifiPHYLayerProtocol();
     switch (wifi_type) {
       case WIFI_PHY_LAYER_PROTOCOL_NONE:
         // No wifi support or no associated AP.
         break;
       case WIFI_PHY_LAYER_PROTOCOL_ANCIENT:
         // An obsolete modes introduced by the original 802.11, e.g. IR, FHSS.
         description = "CONNECTION_WIFI_ANCIENT";
         break;
       case WIFI_PHY_LAYER_PROTOCOL_A:
@@ skipping 607 matching lines @@
       continue;
     }
     // Record some overlapping patterns, to get a better picture, since this is
     // not very expensive.
     if (i % 3 == 0)
       six_packet_histogram->Add(recent_6_mask);
   }
 }
 
 }  // namespace net