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diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.h b/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.h
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+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.h
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+/*
+ * Copyright (C) 2011 Ericsson AB. All rights reserved.
+ * Copyright (C) 2012 Google 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.
+ */
+
+#ifndef RealtimeMediaSourceCenter_h
+#define RealtimeMediaSourceCenter_h
+
+#if ENABLE(MEDIA_STREAM)
+
+#include "RealtimeMediaSource.h"
+#include "RealtimeMediaSourceSupportedConstraints.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class CaptureDevice;
+class MediaConstraints;
+class RealtimeMediaSourceSettings;
+class RealtimeMediaSourceSupportedConstraints;
+class TrackSourceInfo;
+
+class RealtimeMediaSourceCenter {
+public:
+    virtual ~RealtimeMediaSourceCenter();
+
+    WEBCORE_EXPORT static RealtimeMediaSourceCenter& singleton();
+    static void setSharedStreamCenterOverride(RealtimeMediaSourceCenter*);
+
+    using ValidConstraintsHandler = std::function<void(const Vector<String>&& audioDeviceUIDs, const Vector<String>&& videoDeviceUIDs)>;
+    using InvalidConstraintsHandler = std::function<void(const String& invalidConstraint)>;
+    virtual void validateRequestConstraints(ValidConstraintsHandler, InvalidConstraintsHandler, const MediaConstraints& audioConstraints, const MediaConstraints& videoConstraints) = 0;
+
+    using NewMediaStreamHandler = std::function<void(RefPtr<MediaStreamPrivate>&&)>;
+    virtual void createMediaStream(NewMediaStreamHandler, const String& audioDeviceID, const String& videoDeviceID, const MediaConstraints* audioConstraints, const MediaConstraints* videoConstraints) = 0;
+
+    virtual Vector<CaptureDevice> getMediaStreamDevices() = 0;
+    
+    virtual const RealtimeMediaSourceSupportedConstraints& supportedConstraints() { return m_supportedConstraints; }
+
+protected:
+    RealtimeMediaSourceCenter();
+
+    static RealtimeMediaSourceCenter& platformCenter();
+    RealtimeMediaSourceSupportedConstraints m_supportedConstraints;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(MEDIA_STREAM)
+
+#endif // RealtimeMediaSourceCenter_h