Support type selector for camel-cased SVG elements in HTML.

Source/core/css/SelectorChecker.h

Index: Source/core/css/SelectorChecker.h
diff --git a/Source/core/css/SelectorChecker.h b/Source/core/css/SelectorChecker.h
index 563f00d6143fe2adc9b292d1499c418f203b72fb..9c12d8aa1a593049cae840ee5f1fcf5f353e5bad 100644
--- a/Source/core/css/SelectorChecker.h
+++ b/Source/core/css/SelectorChecker.h
@@ -106,11 +106,12 @@ public:
 
     Mode mode() const { return m_mode; }
 
-    static bool tagMatches(const Element&, const QualifiedName&);
+    static bool tagMatches(const Element&, const CSSSelector&);
     static bool isCommonPseudoClassSelector(const CSSSelector&);
     static bool matchesFocusPseudoClass(const Element&);
     static bool matchesSpatialNavigationFocusPseudoClass(const Element&);
     static bool matchesListBoxPseudoClass(const Element&);
+    static bool localNameMatchesLower(const AtomicString& elementName, const AtomicString& camelCasedType);
 
     enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
     static unsigned determineLinkMatchType(const CSSSelector&);
@@ -151,13 +152,18 @@ inline bool SelectorChecker::isCommonPseudoClassSelector(const CSSSelector& sele
         || pseudoType == CSSSelector::PseudoFocus;
 }
 
-inline bool SelectorChecker::tagMatches(const Element& element, const QualifiedName& tagQName)
+inline bool SelectorChecker::tagMatches(const Element& element, const CSSSelector& selector)
 {
+    const QualifiedName& tagQName = selector.tagQName();
     if (tagQName == anyQName())
         return true;
     const AtomicString& localName = tagQName.localName();
-    if (localName != starAtom && localName != element.localName())
-        return false;
+    if (localName != starAtom && localName != element.localName()) {
+        if (!selector.tagIsCamelCase())
+            return false;
+        if (!localNameMatchesLower(element.localName(), localName))
+            return false;
+    }
     const AtomicString& namespaceURI = tagQName.namespaceURI();
     return namespaceURI == starAtom || namespaceURI == element.namespaceURI();
 }