Instrumenting read callbacks to find jank in TCPSocketWin::Core::ReadDelegate::OnObjectSignaled

net/socket/ssl_client_socket_nss.cc

Index: net/socket/ssl_client_socket_nss.cc
diff --git a/net/socket/ssl_client_socket_nss.cc b/net/socket/ssl_client_socket_nss.cc
index c5869fc3503a5ddfa53abb1b9ba0aecbabbfb442..26725353384dbf993a11c8f9493cf5c6d2829024 100644
--- a/net/socket/ssl_client_socket_nss.cc
+++ b/net/socket/ssl_client_socket_nss.cc
@@ -71,6 +71,7 @@
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
@@ -2213,6 +2214,10 @@ void SSLClientSocketNSS::Core::DoReadCallback(int rv) {
   PostOrRunCallback(
       FROM_HERE,
       base::Bind(&Core::DidNSSRead, this, rv));
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/418183 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "SSLClientSocketNSS::Core::DoReadCallback"));
   PostOrRunCallback(
       FROM_HERE,
       base::Bind(base::ResetAndReturn(&user_read_callback_), rv));