Instrumenting more of WM_ message processing for jank

base/message_loop/message_pump_win.cc

Index: base/message_loop/message_pump_win.cc
diff --git a/base/message_loop/message_pump_win.cc b/base/message_loop/message_pump_win.cc
index a219aa6b79255de7fb6e3027b0512407b730a8ff..cb60f2dd3a84e721f9618c3e6139aab57f493681 100644
--- a/base/message_loop/message_pump_win.cc
+++ b/base/message_loop/message_pump_win.cc
@@ -163,9 +163,9 @@ void MessagePumpForUI::ScheduleDelayedWork(const TimeTicks& delayed_work_time) {
 LRESULT CALLBACK MessagePumpForUI::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(
+  tracked_objects::ScopedTracker tracking_profile1(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
-          "440919 MessagePumpForUI::WndProcThunk"));
+          "440919 MessagePumpForUI::WndProcThunk1"));
 
   switch (message) {
     case kMsgHaveWork:
@@ -175,6 +175,12 @@ LRESULT CALLBACK MessagePumpForUI::WndProcThunk(
       reinterpret_cast<MessagePumpForUI*>(wparam)->HandleTimerMessage();
       break;
   }
+
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "440919 MessagePumpForUI::WndProcThunk2"));
+
   return DefWindowProc(hwnd, message, wparam, lparam);
 }