Hoist target element null-checks out of SVGAnimateElement::calculate*

third_party/WebKit/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 555 matching lines @@
     ASSERT(m_keySplines.size() == m_values.size() - 1);
     effectivePercent = calculatePercentForSpline(effectivePercent, index);
   }
 }
 
 void SVGAnimationElement::startedActiveInterval() {
   m_animationValid = false;
 
   if (!isValid())
     return;
-
+  if (!targetElement())
+    return;
   if (!hasValidAttributeType())
     return;
 
   // These validations are appropriate for all animation modes.
   if (fastHasAttribute(SVGNames::keyPointsAttr) &&
       m_keyPoints.size() != m_keyTimes.size())
     return;
 
   AnimationMode animationMode = this->getAnimationMode();
   CalcMode calcMode = this->getCalcMode();
@@ skipping 55 matching lines @@
         (m_keyTimes.size() > 1 && m_keyTimes.size() == m_keyPoints.size());
   }
 
   if (m_animationValid && (isAdditive() || isAccumulated()))
     UseCounter::count(&document(), UseCounter::SVGSMILAdditiveAnimation);
 }
 
 void SVGAnimationElement::updateAnimation(float percent,
                                           unsigned repeatCount,
                                           SVGSMILElement* resultElement) {
-  if (!m_animationValid)
+  if (!m_animationValid || !targetElement())
     return;
 
   float effectivePercent;
   CalcMode calcMode = this->getCalcMode();
   AnimationMode animationMode = this->getAnimationMode();
   if (animationMode == ValuesAnimation) {
     String from;
     String to;
     currentValuesForValuesAnimation(percent, effectivePercent, from, to);
     if (from != m_lastValuesAnimationFrom || to != m_lastValuesAnimationTo) {
@@ skipping 42 matching lines @@
     if (!hasInvalidCSSAttributeType)
       schedule();
   }
 
   // Clear values that may depend on the previous target.
   if (targetElement())
     clearAnimatedType();
 }
 
 }  // namespace blink