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

Source/core/css/CSSLocalNameToLowerMaps.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CSSLocalNameToLowerMaps_h
+#define CSSLocalNameToLowerMaps_h
+
+#include "wtf/HashMap.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/AtomicStringHash.h"
+
+namespace blink {
+
+namespace CSSLocalNameToLowerMaps {
+
+extern HashMap<AtomicString, AtomicString>* s_elementToLowerMap;
+extern HashMap<AtomicString, AtomicString>* s_attributeToLowerMap;
+
+void buildElementToLowerMap();
+void buildAttributeToLowerMap();
+
+inline const HashMap<AtomicString, AtomicString>& ensureElementToLowerMap()
+{
+    if (!s_elementToLowerMap)
+        buildElementToLowerMap();
+    return *s_elementToLowerMap;
+}
+
+inline const HashMap<AtomicString, AtomicString>& ensureAttributeToLowerMap()
+{
+    if (!s_attributeToLowerMap)
+        buildAttributeToLowerMap();
+    return *s_attributeToLowerMap;
+}
+
+inline AtomicString elementToLower(const AtomicString& elementName)
+{
+    return ensureElementToLowerMap().get(elementName);
+}
+
+inline AtomicString attributeToLower(const AtomicString& attributeName)
+{
+    return ensureAttributeToLowerMap().get(attributeName);
+}
+
+} // namespace CSSLocalNameToLowerMaps
+
+} // namespace blink
+
+#endif // CSSLocalNameToLowerMaps_h