Reset SVGAnimationElement values animation state on attribute changes

Source/core/svg/SVGAnimationElement.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  * Copyright (C) Research In Motion Limited 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 224 matching lines @@
         return;
     }
 
     animationAttributeChanged();
 }
 
 void SVGAnimationElement::animationAttributeChanged()
 {
     // Assumptions may not hold after an attribute change.
     m_animationValid = false;
+    m_lastValuesAnimationFrom = String();
+    m_lastValuesAnimationTo = String();
     setInactive();
 }
 
 float SVGAnimationElement::getStartTime() const
 {
     return narrowPrecisionToFloat(intervalBegin().value());
 }
 
 float SVGAnimationElement::getCurrentTime() const
 {
@@ skipping 440 matching lines @@
     SVGSMILElement::setAttributeName(attributeName);
     checkInvalidCSSAttributeType(targetElement());
 }
 
 void SVGAnimationElement::checkInvalidCSSAttributeType(SVGElement* target)
 {
     m_hasInvalidCSSAttributeType = target && hasValidAttributeName() && attributeType() == AttributeTypeCSS && !isTargetAttributeCSSProperty(target, attributeName());
 }
 
 }