Update from https://crrev.com/312398

base/win/message_window.cc

 // Copyright 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 "base/win/message_window.h"
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/process/memory.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/win/wrapped_window_proc.h"
 
 const wchar_t kMessageWindowClassName[] = L"Chrome_MessageWindow";
 
 namespace base {
 namespace win {
 
 // Used along with LazyInstance to register a window class for message-only
 // windows created by MessageWindow.
 class MessageWindow::WindowClass {
@@ skipping 93 matching lines @@
   }
 
   return true;
 }
 
 // static
 LRESULT CALLBACK MessageWindow::WindowProc(HWND hwnd,
                                            UINT message,
                                            WPARAM wparam,
                                            LPARAM lparam) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("440919 MessageWindow::WindowProc"));
+
   MessageWindow* self = reinterpret_cast<MessageWindow*>(
       GetWindowLongPtr(hwnd, GWLP_USERDATA));
 
   switch (message) {
     // Set up the self before handling WM_CREATE.
     case WM_CREATE: {
       CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(lparam);
       self = reinterpret_cast<MessageWindow*>(cs->lpCreateParams);
 
       // Make |hwnd| available to the message handler. At this point the control
@@ skipping 23 matching lines @@
     LRESULT message_result;
     if (self->message_callback_.Run(message, wparam, lparam, &message_result))
       return message_result;
   }
 
   return DefWindowProc(hwnd, message, wparam, lparam);
 }
 
 }  // namespace win
 }  // namespace base