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diff --git a/Source/WebCore/dom/CustomElementReactionQueue.h b/Source/WebCore/dom/CustomElementReactionQueue.h
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+++ b/Source/WebCore/dom/CustomElementReactionQueue.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 <wtf/Forward.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class CustomElementReactionQueueItem;
+class Document;
+class Element;
+class JSCustomElementInterface;
+class QualifiedName;
+
+class CustomElementReactionQueue {
+    WTF_MAKE_NONCOPYABLE(CustomElementReactionQueue);
+public:
+    CustomElementReactionQueue(JSCustomElementInterface&);
+    ~CustomElementReactionQueue();
+
+    static void enqueueElementUpgrade(Element&);
+    static void enqueueElementUpgradeIfDefined(Element&);
+    static void enqueueConnectedCallbackIfNeeded(Element&);
+    static void enqueueDisconnectedCallbackIfNeeded(Element&);
+    static void enqueueAdoptedCallbackIfNeeded(Element&, Document& oldDocument, Document& newDocument);
+    static void enqueueAttributeChangedCallbackIfNeeded(Element&, const QualifiedName&, const AtomicString& oldValue, const AtomicString& newValue);
+    static void enqueuePostUpgradeReactions(Element&);
+
+    bool observesStyleAttribute() const;
+    void invokeAll(Element&);
+    void clear();
+
+private:
+    Ref<JSCustomElementInterface> m_interface;
+    Vector<CustomElementReactionQueueItem> m_items;
+};
+
+class CustomElementReactionStack {
+public:
+    CustomElementReactionStack()
+        : m_previousProcessingStack(s_currentProcessingStack)
+    {
+        s_currentProcessingStack = this;
+    }
+
+    ~CustomElementReactionStack()
+    {
+        if (UNLIKELY(m_queue))
+            processQueue();
+        s_currentProcessingStack = m_previousProcessingStack;
+    }
+
+    static CustomElementReactionQueue& ensureCurrentQueue(Element&);
+
+    static bool hasCurrentProcessingStack() { return s_currentProcessingStack; }
+
+    static void processBackupQueue();
+
+private:
+    class ElementQueue {
+    public:
+        void add(Element&);
+        void invokeAll();
+
+    private:
+        Vector<Ref<Element>> m_elements;
+        bool m_invoking { false };
+    };
+
+    WEBCORE_EXPORT void processQueue();
+
+    static ElementQueue& ensureBackupQueue();
+    static ElementQueue& backupElementQueue();
+
+    ElementQueue* m_queue { nullptr };
+    CustomElementReactionStack* m_previousProcessingStack;
+
+    WEBCORE_EXPORT static CustomElementReactionStack* s_currentProcessingStack;
+};
+
+}