Begin tracking why layout is invalidated

Source/core/layout/svg/SVGLayoutSupport.cpp

 /*
  * Copyright (C) 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2009-2010. 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
@@ skipping 249 matching lines @@
                 }
             }
         }
 
         SubtreeLayoutScope layoutScope(*child);
         // Resource containers are nasty: they can invalidate clients outside the current SubtreeLayoutScope.
         // Since they only care about viewport size changes (to resolve their relative lengths), we trigger
         // their invalidation directly from SVGSVGElement::svgAttributeChange() or at a higher
         // SubtreeLayoutScope (in LayoutView::layout()).
         if (forceLayout && !child->isSVGResourceContainer())
-            layoutScope.setNeedsLayout(child);
+            layoutScope.setNeedsLayout(child, LayoutInvalidationReason::SvgChanged);
 
         // Lay out any referenced resources before the child.
         layoutResourcesIfNeeded(child);
         child->layoutIfNeeded();
     }
 }
 
 void SVGLayoutSupport::layoutResourcesIfNeeded(const LayoutObject* object)
 {
     ASSERT(object);
@@ skipping 223 matching lines @@
 
         layer = layer->parent();
     }
 
     ctm.scale(deviceScaleFactor);
 
     return narrowPrecisionToFloat(sqrt((pow(ctm.xScale(), 2) + pow(ctm.yScale(), 2)) / 2));
 }
 
 }