Begin tracking why layout is invalidated

Source/core/html/HTMLFrameSetElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  *
  * 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
@@ skipping 186 matching lines @@
     if (insertionPoint->inDocument() && document().frame()) {
         // A document using <frameset> likely won't literally have a body, but as far as the client is concerned, the frameset is effectively the body.
         document().frame()->loader().client()->dispatchWillInsertBody();
     }
     return HTMLElement::insertedInto(insertionPoint);
 }
 
 void HTMLFrameSetElement::willRecalcStyle(StyleRecalcChange)
 {
     if (needsStyleRecalc() && layoutObject()) {
-        layoutObject()->setNeedsLayoutAndFullPaintInvalidation();
+        layoutObject()->setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReason::StyleChange);
         clearNeedsStyleRecalc();
     }
 }
 
 LocalDOMWindow* HTMLFrameSetElement::anonymousNamedGetter(const AtomicString& name)
 {
     Element* frameElement = children()->namedItem(name);
     if (!isHTMLFrameElement(frameElement))
         return nullptr;
     Document* document = toHTMLFrameElement(frameElement)->contentDocument();
     if (!document || !document->frame())
         return nullptr;
     return document->domWindow();
 }
 
 } // namespace blink