Trace where timers were scheduled in Blink

Source/platform/scroll/Scrollbar.cpp

 /*
  * Copyright (C) 2004, 2006, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 231 matching lines @@
     // We can't scroll if we've hit the beginning or end.
     ScrollDirection dir = pressedPartScrollDirection();
     if (dir == ScrollUp || dir == ScrollLeft) {
         if (m_currentPos == 0)
             return;
     } else {
         if (m_currentPos == maximum())
             return;
     }
 
-    m_scrollTimer.startOneShot(delay);
+    m_scrollTimer.startOneShot(delay, FROM_HERE);
 }
 
 void Scrollbar::stopTimerIfNeeded()
 {
     if (m_scrollTimer.isActive())
         m_scrollTimer.stop();
 }
 
 ScrollDirection Scrollbar::pressedPartScrollDirection()
 {
@@ skipping 334 matching lines @@
     if (!m_scrollableArea)
         return 0;
 
     if (m_orientation == HorizontalScrollbar)
         return m_scrollableArea->scrollPosition().x() - m_scrollableArea->minimumScrollPosition().x();
 
     return m_scrollableArea->scrollPosition().y() - m_scrollableArea->minimumScrollPosition().y();
 }
 
 } // namespace WebCore