Update from https://crrev.com/307330

net/ftp/ftp_network_transaction.cc

Index: net/ftp/ftp_network_transaction.cc
diff --git a/net/ftp/ftp_network_transaction.cc b/net/ftp/ftp_network_transaction.cc
index 74bd6bf6f8dcdb9109dbc953fbeb5649084b4c02..17d5754b6c01fb9f98c3ae30891bf6f43b64703d 100644
--- a/net/ftp/ftp_network_transaction.cc
+++ b/net/ftp/ftp_network_transaction.cc
@@ -8,6 +8,7 @@
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/string_split.h"
@@ -372,6 +373,11 @@ void FtpNetworkTransaction::DoCallback(int rv) {
 }
 
 void FtpNetworkTransaction::OnIOComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/436634 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "436634 FtpNetworkTransaction::OnIOComplete"));
+
   int rv = DoLoop(result);
   if (rv != ERR_IO_PENDING)
     DoCallback(rv);