CSS: SVG use elements replicate updates to style

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009, 2014 Apple Inc. 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 162 matching lines @@
         WTF_MAKE_NONCOPYABLE(InstanceUpdateBlocker);
     public:
         InstanceUpdateBlocker(SVGElement* targetElement);
         ~InstanceUpdateBlocker();
 
     private:
         Member<SVGElement> m_targetElement;
     };
 
     void invalidateInstances();
+    void instancesNeedsStyleRecalc(StyleChangeType, const StyleChangeReasonForTracing&);

[rune, 2016/08/18 23:43:07]

Name sounds like returning a bool to me. How about
setNeedsStyleRecalcForInstances?

[Eric Willigers, 2016/08/19 00:44:19]

Done.

 
     DECLARE_VIRTUAL_TRACE();
 
     static const AtomicString& eventParameterName();
 
     bool isPresentationAttribute(const QualifiedName&) const override;
     virtual bool isPresentationAttributeWithSVGDOM(const QualifiedName&) const { return false; }
 
 protected:
     SVGElement(const QualifiedName&, Document&, ConstructionType = CreateSVGElement);
@@ skipping 87 matching lines @@
     template<typename T> inline bool is##thisType(const T* node) { return is##thisType(node); } \
     template<typename T> inline bool is##thisType(const Member<T>& node) { return is##thisType(node.get()); } \
     template <> inline bool isElementOfType<const thisType>(const SVGElement& element) { return is##thisType(element); } \
     DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 } // namespace blink
 
 #include "core/SVGElementTypeHelpers.h"
 
 #endif // SVGElement_h