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diff --git a/Source/WebCore/dom/CustomElementRegistry.h b/Source/WebCore/dom/CustomElementRegistry.h
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+++ b/Source/WebCore/dom/CustomElementRegistry.h
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+/*
+ * Copyright (C) 2015, 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JSDOMPromise.h"
+#include "QualifiedName.h"
+#include <wtf/HashMap.h>
+#include <wtf/SetForScope.h>
+#include <wtf/text/AtomicString.h>
+#include <wtf/text/AtomicStringHash.h>
+
+namespace JSC {
+
+class JSObject;
+class JSValue;
+    
+}
+
+namespace WebCore {
+
+class CustomElementRegistry;
+class DOMWindow;
+class Element;
+class JSCustomElementInterface;
+class QualifiedName;
+
+class CustomElementRegistry : public RefCounted<CustomElementRegistry> {
+public:
+    static Ref<CustomElementRegistry> create(DOMWindow&);
+    ~CustomElementRegistry();
+
+    void addElementDefinition(Ref<JSCustomElementInterface>&&);
+
+    bool& elementDefinitionIsRunning() { return m_elementDefinitionIsRunning; }
+
+    JSCustomElementInterface* findInterface(const Element&) const;
+    JSCustomElementInterface* findInterface(const QualifiedName&) const;
+    JSCustomElementInterface* findInterface(const AtomicString&) const;
+    JSCustomElementInterface* findInterface(const JSC::JSObject*) const;
+    bool containsConstructor(const JSC::JSObject*) const;
+
+    JSC::JSValue get(const AtomicString&);
+
+    HashMap<AtomicString, Ref<DeferredPromise>>& promiseMap() { return m_promiseMap; }
+
+private:
+    CustomElementRegistry(DOMWindow&);
+
+    DOMWindow& m_window;
+    HashMap<AtomicString, Ref<JSCustomElementInterface>> m_nameMap;
+    HashMap<const JSC::JSObject*, JSCustomElementInterface*> m_constructorMap;
+    HashMap<AtomicString, Ref<DeferredPromise>> m_promiseMap;
+
+    bool m_elementDefinitionIsRunning { false };
+
+    friend class ElementDefinitionIsRunningSetForScope;
+};
+
+}