Begin tracking why layout is invalidated

Source/core/layout/LayoutListItem.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 235 matching lines @@
     }
 
     return 0;
 }
 
 void LayoutListItem::updateValue()
 {
     if (!m_hasExplicitValue) {
         m_isValueUpToDate = false;
         if (m_marker)
-            m_marker->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+            m_marker->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::ListValueChange);
     }
 }
 
 static LayoutObject* firstNonMarkerChild(LayoutObject* parent)
 {
     LayoutObject* result = parent->slowFirstChild();
     while (result && result->isListMarker())
         result = result->nextSibling();
     return result;
 }
@@ skipping 183 matching lines @@
 const String& LayoutListItem::markerText() const
 {
     if (m_marker)
         return m_marker->text();
     return nullAtom.string();
 }
 
 void LayoutListItem::explicitValueChanged()
 {
     if (m_marker)
-        m_marker->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+        m_marker->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::ListValueChange);
     Node* listNode = enclosingList(this);
     for (LayoutListItem* item = this; item; item = nextListItem(listNode, item))
         item->updateValue();
 }
 
 void LayoutListItem::setExplicitValue(int value)
 {
     ASSERT(node());
 
     if (m_hasExplicitValue && m_explicitValue == value)
@@ skipping 57 matching lines @@
             // assume that all the following ones have too.
             // This gives us the opportunity to stop here and avoid
             // marking the same nodes again.
             break;
         }
         item->updateValue();
     }
 }
 
 } // namespace blink