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diff --git a/third_party/libwebrtc/api/video/video_stream_decoder.h b/third_party/libwebrtc/api/video/video_stream_decoder.h
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+++ b/third_party/libwebrtc/api/video/video_stream_decoder.h
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2018 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 API_VIDEO_VIDEO_STREAM_DECODER_H_
+#define API_VIDEO_VIDEO_STREAM_DECODER_H_
+
+#include <map>
+#include <memory>
+#include <utility>
+
+#include "api/units/time_delta.h"
+#include "api/video/encoded_frame.h"
+#include "api/video/video_content_type.h"
+#include "api/video/video_frame.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "api/video_codecs/video_decoder_factory.h"
+
+namespace webrtc {
+// NOTE: This class is still under development and may change without notice.
+class VideoStreamDecoderInterface {
+ public:
+  class Callbacks {
+   public:
+    virtual ~Callbacks() = default;
+
+    struct FrameInfo {
+      absl::optional<int> qp;
+      VideoContentType content_type;
+    };
+
+    // Called when the VideoStreamDecoder enters a non-decodable state.
+    virtual void OnNonDecodableState() = 0;
+
+    virtual void OnContinuousUntil(int64_t frame_id) {}
+
+    virtual void OnDecodedFrame(VideoFrame frame,
+                                const FrameInfo& frame_info) = 0;
+  };
+
+  virtual ~VideoStreamDecoderInterface() = default;
+
+  virtual void OnFrame(std::unique_ptr<EncodedFrame> frame) = 0;
+
+  virtual void SetMinPlayoutDelay(TimeDelta min_delay) = 0;
+  virtual void SetMaxPlayoutDelay(TimeDelta max_delay) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_VIDEO_STREAM_DECODER_H_