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diff --git a/Source/WebCore/Modules/mediastream/MediaDevices.h b/Source/WebCore/Modules/mediastream/MediaDevices.h
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+++ b/Source/WebCore/Modules/mediastream/MediaDevices.h
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+/*
+ * Copyright (C) 2015 Ericsson AB. All rights reserved.
+ * 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.
+ * 3. Neither the name of Ericsson nor the names of its contributors
+ *    may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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 "ExceptionOr.h"
+#include "JSDOMPromise.h"
+#include "MediaTrackConstraints.h"
+
+namespace WebCore {
+
+class Document;
+class MediaDeviceInfo;
+class MediaStream;
+
+struct MediaTrackSupportedConstraints;
+
+class MediaDevices : public ScriptWrappable, public RefCounted<MediaDevices>, public ContextDestructionObserver {
+public:
+    static Ref<MediaDevices> create(Document&);
+
+    Document* document() const;
+
+    using Promise = DOMPromise<IDLInterface<MediaStream>>;
+    using EnumerateDevicesPromise = DOMPromise<IDLSequence<IDLInterface<MediaDeviceInfo>>>;
+
+    struct StreamConstraints {
+        Variant<bool, MediaTrackConstraints> video;
+        Variant<bool, MediaTrackConstraints> audio;
+    };
+    ExceptionOr<void> getUserMedia(const StreamConstraints&, Promise&&) const;
+    void enumerateDevices(EnumerateDevicesPromise&&) const;
+    MediaTrackSupportedConstraints getSupportedConstraints();
+
+private:
+    explicit MediaDevices(Document&);
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(MEDIA_STREAM)