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diff --git a/third_party/libwebrtc/examples/unityplugin/video_observer.h b/third_party/libwebrtc/examples/unityplugin/video_observer.h
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+++ b/third_party/libwebrtc/examples/unityplugin/video_observer.h
@@ -0,0 +1,35 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef EXAMPLES_UNITYPLUGIN_VIDEO_OBSERVER_H_
+#define EXAMPLES_UNITYPLUGIN_VIDEO_OBSERVER_H_
+
+#include <mutex>
+
+#include "api/media_stream_interface.h"
+#include "api/video/video_sink_interface.h"
+#include "examples/unityplugin/unity_plugin_apis.h"
+
+class VideoObserver : public rtc::VideoSinkInterface<webrtc::VideoFrame> {
+ public:
+  VideoObserver() {}
+  ~VideoObserver() {}
+  void SetVideoCallback(I420FRAMEREADY_CALLBACK callback);
+
+ protected:
+  // VideoSinkInterface implementation
+  void OnFrame(const webrtc::VideoFrame& frame) override;
+
+ private:
+  I420FRAMEREADY_CALLBACK OnI420FrameReady = nullptr;
+  std::mutex mutex;
+};
+
+#endif  // EXAMPLES_UNITYPLUGIN_VIDEO_OBSERVER_H_