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diff --git a/dom/media/webrtc/MediaEngineFake.h b/dom/media/webrtc/MediaEngineFake.h
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MEDIAENGINEFAKE_H_
+#define MEDIAENGINEFAKE_H_
+
+#include "nsTArrayForwardDeclare.h"
+#include "MediaEngine.h"
+
+namespace mozilla {
+
+template <typename...>
+class MediaEventProducer;
+
+/**
+ * The fake implementation of the MediaEngine interface.
+ */
+class MediaEngineFake : public MediaEngine {
+ public:
+ MediaEngineFake();
+
+ void EnumerateDevices(dom::MediaSourceEnum, MediaSinkEnum,
+ nsTArray<RefPtr<MediaDevice>>*) override;
+ void Shutdown() override {}
+ RefPtr<MediaEngineSource> CreateSource(const MediaDevice* aDevice) override;
+
+ MediaEventSource<void>& DeviceListChangeEvent() override {
+ return mDeviceListChangeEvent;
+ }
+ bool IsFake() const override { return true; }
+
+ private:
+ ~MediaEngineFake();
+ MediaEventProducer<void> mDeviceListChangeEvent;
+};
+
+} // namespace mozilla
+
+#endif /* NSMEDIAENGINEFAKE_H_ */