Mark when we may have been invalidated to early out on repaintTreeAfterLayout.

Source/core/rendering/svg/RenderSVGRoot.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) Research In Motion Limited 2011. 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 150 matching lines @@
     return RenderReplaced::computeReplacedLogicalHeight();
 }
 
 void RenderSVGRoot::layout()
 {
     ASSERT(needsLayout());
 
     // Arbitrary affine transforms are incompatible with LayoutState.
     LayoutStateDisabler layoutStateDisabler(*this);
 
+    setMayNeedInvalidation(true);
+
     bool needsLayout = selfNeedsLayout();
     LayoutRepainter repainter(*this, checkForRepaintDuringLayout() && needsLayout);
 
     LayoutSize oldSize = size();
     updateLogicalWidth();
     updateLogicalHeight();
     buildLocalToBorderBoxTransform();
 
     SVGRenderSupport::layoutResourcesIfNeeded(this);
 
@@ skipping 271 matching lines @@
             updateHitTestResult(result, pointInBorderBox);
             if (!result.addNodeToRectBasedTestResult(node(), request, locationInContainer, boundsRect))
                 return true;
         }
     }
 
     return false;
 }
 
 }