Update from https://crrev.com/312398

base/power_monitor/power_monitor_device_source_win.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/power_monitor/power_monitor.h"
 #include "base/power_monitor/power_monitor_device_source.h"
 #include "base/power_monitor/power_monitor_source.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/win/wrapped_window_proc.h"
 
 namespace base {
 
 void ProcessPowerEventHelper(PowerMonitorSource::PowerEvent event) {
   PowerMonitorSource::ProcessPowerEvent(event);
 }
 
 namespace {
 
@@ skipping 73 matching lines @@
     UnregisterClass(kWindowClassName, instance_);
   }
 }
 
 // static
 LRESULT CALLBACK PowerMonitorDeviceSource::PowerMessageWindow::WndProcThunk(
     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 PowerMonitorDeviceSource::PowerMessageWindow::WndProcThunk"));
+
   switch (message) {
     case WM_POWERBROADCAST:
       ProcessWmPowerBroadcastMessage(wparam);
       return TRUE;
     default:
       return ::DefWindowProc(hwnd, message, wparam, lparam);
   }
 }
 
 }  // namespace base