SVG <use> should update when the referenced <path> is updating pathSegList.

Source/core/svg/SVGPathElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 232 matching lines @@
 }
 
 void SVGPathElement::removedFrom(ContainerNode* rootParent)
 {
     SVGGeometryElement::removedFrom(rootParent);
     invalidateMPathDependencies();
 }
 
 void SVGPathElement::pathSegListChanged(ListModification listModification)
 {
+    SVGElement::InvalidationGuard invalidationGuard(this);

[fs, 2015/05/13 12:35:21]

Move this down a bit. (After invalidateSVGAttributes should be ok I think.)

[Shanmuga Pandi, 2015/05/13 13:00:40]

Done.

     m_pathSegList->baseValue()->clearByteStream();
 
     invalidateSVGAttributes();
 
     LayoutSVGShape* layoutObject = toLayoutSVGShape(this->layoutObject());
     if (!layoutObject)
         return;
 
     layoutObject->setNeedsShapeUpdate();
     markForLayoutAndParentResourceInvalidation(layoutObject);
 }
 
 FloatRect SVGPathElement::getBBox()
 {
     // By default, getBBox() returns objectBoundingBox but that will include
     // markers so we override it to return just the path's bounding rect.
 
     document().updateLayoutIgnorePendingStylesheets();
 
     // FIXME: Eventually we should support getBBox for detached elements.
     if (!layoutObject())
         return FloatRect();
 
     LayoutSVGShape* layoutObject = toLayoutSVGShape(this->layoutObject());
     return layoutObject->path().boundingRect();
 }
 
 } // namespace blink