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diff --git a/Source/WebCore/dom/ActiveDOMCallbackMicrotask.h b/Source/WebCore/dom/ActiveDOMCallbackMicrotask.h
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+++ b/Source/WebCore/dom/ActiveDOMCallbackMicrotask.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. AND ITS CONTRIBUTORS ``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 ITS 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 "ActiveDOMCallback.h"
+#include "Microtasks.h"
+#include <wtf/Function.h>
+
+namespace WebCore {
+
+class ActiveDOMCallbackMicrotask final : public Microtask, public ActiveDOMCallback {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    WEBCORE_EXPORT ActiveDOMCallbackMicrotask(MicrotaskQueue&, ScriptExecutionContext&, WTF::Function<void ()>&&);
+    WEBCORE_EXPORT virtual ~ActiveDOMCallbackMicrotask();
+
+    Result run() override;
+
+private:
+    void contextDestroyed() override;
+
+    // FIXME: It should not be necessary to have the queue as a member. Instead, it should
+    // be accessed via the ScriptExecutionContext, which should hold a reference to the relevent
+    // queue.
+    MicrotaskQueue& m_queue;
+    WTF::Function<void ()> m_task;
+};
+
+} // namespace WebCore