CSS: SVG use elements replicate updates to style

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
  * License as published by the Free Software Foundation; either
@@ skipping 963 matching lines @@
 
         if (SVGUseElement* element = instance->correspondingUseElement()) {
             if (element->isConnected())
                 element->invalidateShadowTree();
         }
     }
 
     svgRareData()->elementInstances().clear();
 }
 
+void SVGElement::setNeedsStyleRecalcForInstances(StyleChangeType changeType, const StyleChangeReasonForTracing& reason)
+{
+    const HeapHashSet<WeakMember<SVGElement>>& set = instancesForElement();
+    if (set.isEmpty())
+        return;
+
+    for (SVGElement* instance : set)
+        instance->setNeedsStyleRecalc(changeType, reason);
+}
+
 SVGElement::InstanceUpdateBlocker::InstanceUpdateBlocker(SVGElement* targetElement)
     : m_targetElement(targetElement)
 {
     if (m_targetElement)
         m_targetElement->setInstanceUpdatesBlocked(true);
 }
 
 SVGElement::InstanceUpdateBlocker::~InstanceUpdateBlocker()
 {
     if (m_targetElement)
@@ skipping 175 matching lines @@
     Element::trace(visitor);
 }
 
 const AtomicString& SVGElement::eventParameterName()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, evtString, ("evt"));
     return evtString;
 }
 
 } // namespace blink