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

net/socket/tcp_client_socket.cc

Index: net/socket/tcp_client_socket.cc
diff --git a/net/socket/tcp_client_socket.cc b/net/socket/tcp_client_socket.cc
index a16e11e89ee4dff9ee7c6dd06bbd475ea4eb763e..96402fe1fb642797237ed1aaf2c1f88824cd0106 100644
--- a/net/socket/tcp_client_socket.cc
+++ b/net/socket/tcp_client_socket.cc
@@ -6,6 +6,7 @@
 
 #include "base/callback_helpers.h"
 #include "base/logging.h"
+#include "base/profiler/scoped_profile.h"
 #include "net/base/io_buffer.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
@@ -306,6 +307,10 @@ void TCPClientSocket::DidCompleteReadWrite(const CompletionCallback& callback,
   if (result > 0)
     use_history_.set_was_used_to_convey_data();
 
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/418183 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "TCPClientSocket::DidCompleteReadWrite"));
   callback.Run(result);
 }