SVG: SVGAnimateElement should not cache |m_animatedElements|

Source/core/svg/SVGUseElement.cpp

Index: Source/core/svg/SVGUseElement.cpp
diff --git a/Source/core/svg/SVGUseElement.cpp b/Source/core/svg/SVGUseElement.cpp
index 36e9abf7495a092f5cc0351e34de6fd3cf63b43b..8045c508da04794d8b4696abc85e9e68d998229a 100644
--- a/Source/core/svg/SVGUseElement.cpp
+++ b/Source/core/svg/SVGUseElement.cpp
@@ -364,6 +364,18 @@ void SVGUseElement::buildPendingResource()
     ASSERT(!m_needsShadowTreeRecreation);
 }
 
+namespace {
+
+void rebuildNonUseElementReferencesForTree(SVGElement* shadowTreeTargetElement)
+{
+    shadowTreeTargetElement->document().accessSVGExtensions().rebuildAllElementReferencesForTarget(shadowTreeTargetElement, SVGDocumentExtensions::ExcludeUseElements);
+
+    for (SVGElement* child = Traversal<SVGElement>::firstChild(*shadowTreeTargetElement); child; child = Traversal<SVGElement>::nextSibling(*child))
+        rebuildNonUseElementReferencesForTree(child);
+}
+
+} // namespace
+
 void SVGUseElement::buildShadowAndInstanceTree(SVGElement* target)
 {
     ASSERT(!m_targetElementInstance);
@@ -451,6 +463,10 @@ void SVGUseElement::buildShadowAndInstanceTree(SVGElement* target)
 
     // Update relative length information.
     updateRelativeLengthsInformation();
+
+    // Element references need to be rebuilt to include the new shadow tree.
+    // <use> elements are excluded from notification to avoid infinite loop.
+    rebuildNonUseElementReferencesForTree(target);
 }
 
 RenderObject* SVGUseElement::createRenderer(RenderStyle*)