Instrumenting WindowImpl::WndProc to find jank

ui/gfx/win/window_impl.cc

Index: ui/gfx/win/window_impl.cc
diff --git a/ui/gfx/win/window_impl.cc b/ui/gfx/win/window_impl.cc
index 5820ed64a6e8a555f98a051e1c7734213775bff3..29b96fe7adf5f304be21890110fe89e661bf325d 100644
--- a/ui/gfx/win/window_impl.cc
+++ b/ui/gfx/win/window_impl.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/debug/alias.h"
 #include "base/memory/singleton.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/lock.h"
 #include "base/win/wrapped_window_proc.h"
@@ -282,6 +283,10 @@ LRESULT CALLBACK WindowImpl::WndProc(HWND hwnd,
                                      WPARAM w_param,
                                      LPARAM l_param) {
   if (message == WM_NCCREATE) {
+    // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
+    tracked_objects::ScopedTracker tracking_profile1(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION("440919 WindowImpl::WndProc1"));
+
     CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(l_param);
     WindowImpl* window = reinterpret_cast<WindowImpl*>(cs->lpCreateParams);
     DCHECK(window);
@@ -293,6 +298,10 @@ LRESULT CALLBACK WindowImpl::WndProc(HWND hwnd,
     return TRUE;
   }
 
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("440919 WindowImpl::WndProc2"));
+
   WindowImpl* window = reinterpret_cast<WindowImpl*>(GetWindowUserData(hwnd));
   if (!window)
     return 0;