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diff --git a/Source/WebCore/Modules/mediastream/MediaDevicesEnumerationRequest.h b/Source/WebCore/Modules/mediastream/MediaDevicesEnumerationRequest.h
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+++ b/Source/WebCore/Modules/mediastream/MediaDevicesEnumerationRequest.h
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+/*
+ * Copyright (C) 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
+
+#if ENABLE(MEDIA_STREAM)
+
+#include "ActiveDOMObject.h"
+#include <functional>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class CaptureDevice;
+class Document;
+class SecurityOrigin;
+
+class MediaDevicesEnumerationRequest final : public ContextDestructionObserver, public RefCounted<MediaDevicesEnumerationRequest> {
+public:
+    using CompletionHandler = std::function<void(const Vector<CaptureDevice>&, const String& deviceIdentifierHashSalt, bool originHasPersistentAccess)>;
+
+    static Ref<MediaDevicesEnumerationRequest> create(Document&, CompletionHandler&&);
+
+    virtual ~MediaDevicesEnumerationRequest();
+
+    void start();
+    void cancel();
+
+    WEBCORE_EXPORT void setDeviceInfo(const Vector<CaptureDevice>&, const String& deviceIdentifierHashSalt, bool originHasPersistentAccess);
+
+    WEBCORE_EXPORT SecurityOrigin* userMediaDocumentOrigin() const;
+    WEBCORE_EXPORT SecurityOrigin* topLevelDocumentOrigin() const;
+
+private:
+    MediaDevicesEnumerationRequest(ScriptExecutionContext&, CompletionHandler&&);
+
+    // ContextDestructionObserver
+    void contextDestroyed() final;
+
+    CompletionHandler m_completionHandler;
+    Vector<CaptureDevice> m_deviceList;
+    String m_deviceIdentifierHashSalt;
+    bool m_originHasPersistentAccess { false };
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(MEDIA_STREAM)