Update from https://crrev.com/312398

base/power_monitor/power_monitor_device_source_win.cc

Index: base/power_monitor/power_monitor_device_source_win.cc
diff --git a/base/power_monitor/power_monitor_device_source_win.cc b/base/power_monitor/power_monitor_device_source_win.cc
index b8b16e1d3449ca8122f29a5fa094d57695ecb62b..0e199dcddbbb88650b745b1afeee2ae2b2816874 100644
--- a/base/power_monitor/power_monitor_device_source_win.cc
+++ b/base/power_monitor/power_monitor_device_source_win.cc
@@ -5,6 +5,7 @@
 #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 {
@@ -98,6 +99,11 @@ LRESULT CALLBACK PowerMonitorDeviceSource::PowerMessageWindow::WndProcThunk(
     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);