Don't clear 'web animations dirty' flag if we have no rare data

third_party/WebKit/Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann
  * <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 225 matching lines @@
       EffectStack::activeInterpolations(
           &elementAnimations()->effectStack(), nullptr, nullptr,
           KeyframeEffectReadOnly::DefaultPriority, isSVGAttributeHandle);
   for (auto& entry : activeInterpolationsMap) {
     const QualifiedName& attribute = entry.key.svgAttribute();
     SVGInterpolationTypesMap map;
     InterpolationEnvironment environment(
         map, *this, propertyFromAttribute(attribute)->baseValueBase());
     InvalidatableInterpolation::applyStack(entry.value, environment);
   }
+  if (!hasSVGRareData())
+    return;
   svgRareData()->setWebAnimatedAttributesDirty(false);
 }
 
 static inline void notifyAnimValChanged(SVGElement* targetElement,
                                         const QualifiedName& attributeName) {
   targetElement->invalidateSVGAttributes();
   targetElement->svgAttributeChanged(attributeName);
 }
 
 template <typename T>
@@ skipping 1044 matching lines @@
   visitor->trace(m_className);
   Element::trace(visitor);
 }
 
 const AtomicString& SVGElement::eventParameterName() {
   DEFINE_STATIC_LOCAL(const AtomicString, evtString, ("evt"));
   return evtString;
 }
 
 }  // namespace blink