Make supportsMarkers non virtual

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index ca015d3ee51e2cd407a6d61be7d794ee9b1140b7..4f78570c5ce4dab09b5e970d24a904d965ffaf84 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -260,6 +260,19 @@ String SVGElement::title() const
     return String();
 }
 
+bool SVGElement::supportsMarkers() const
+{
+    DEFINE_STATIC_LOCAL(HashSet<AtomicString>, s_tagList, ());
+    if (s_tagList.isEmpty()) {
+        s_tagList.add(SVGNames::lineTag.localName());
+        s_tagList.add(SVGNames::pathTag.localName());
+        s_tagList.add(SVGNames::polygonTag.localName());
+        s_tagList.add(SVGNames::polylineTag.localName());
+    }
+
+    return s_tagList.contains(localName());

[f(malita), 2014/03/19 14:58:55]

We're replacing a virtual call with a hashset lookup during shape layout. Not
sure whether this is noticeable, but we should double check - can you run the
SVG perf tests locally and make sure we're not introducing regressions?

+}
+
 PassRefPtrWillBeRawPtr<CSSValue> SVGElement::getPresentationAttribute(const AtomicString& name)
 {
     if (!hasAttributesWithoutUpdate())