Trace where timers were scheduled in Blink

Source/web/ExternalPopupMenu.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 63 matching lines @@
         return;
     m_webExternalPopupMenu = m_webView.client()->createExternalPopupMenu(info, this);
     if (m_webExternalPopupMenu) {
         m_webExternalPopupMenu->show(m_frameView->contentsToWindow(rect));
 #if OS(MACOSX)
         const WebInputEvent* currentEvent = WebViewImpl::currentInputEvent();
         if (currentEvent && currentEvent->type == WebInputEvent::MouseDown) {
             m_syntheticEvent = adoptPtr(new WebMouseEvent);
             *m_syntheticEvent = *static_cast<const WebMouseEvent*>(currentEvent);
             m_syntheticEvent->type = WebInputEvent::MouseUp;
-            m_dispatchEventTimer.startOneShot(0);
+            m_dispatchEventTimer.startOneShot(0, FROM_HERE);
             // FIXME: show() is asynchronous. If preparing a popup is slow and
             // a user released the mouse button before showing the popup,
             // mouseup and click events are correctly dispatched. Dispatching
             // the synthetic mouseup event is redundant in this case.
         }
 #endif
     } else {
         // The client might refuse to create a popup (when there is already one pending to be shown for example).
         didCancel();
     }
@@ skipping 111 matching lines @@
 
     info->itemHeight = m_popupMenuClient->menuStyle().font().fontMetrics().height();
     info->itemFontSize = static_cast<int>(m_popupMenuClient->menuStyle().font().fontDescription().computedSize());
     info->selectedIndex = m_popupMenuClient->selectedIndex();
     info->rightAligned = m_popupMenuClient->menuStyle().textDirection() == WebCore::RTL;
     info->allowMultipleSelection = m_popupMenuClient->multiple();
     info->items.swap(items);
 }
 
 }