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diff --git a/third_party/libwebrtc/api/test/frame_generator_interface.h b/third_party/libwebrtc/api/test/frame_generator_interface.h
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+++ b/third_party/libwebrtc/api/test/frame_generator_interface.h
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+/*
+ *  Copyright (c) 2019 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_TEST_FRAME_GENERATOR_INTERFACE_H_
+#define API_TEST_FRAME_GENERATOR_INTERFACE_H_
+
+#include <utility>
+
+#include "absl/types/optional.h"
+#include "api/scoped_refptr.h"
+#include "api/video/video_frame.h"
+#include "api/video/video_frame_buffer.h"
+
+namespace webrtc {
+namespace test {
+
+class FrameGeneratorInterface {
+ public:
+  struct VideoFrameData {
+    VideoFrameData(rtc::scoped_refptr<VideoFrameBuffer> buffer,
+                   absl::optional<VideoFrame::UpdateRect> update_rect)
+        : buffer(std::move(buffer)), update_rect(update_rect) {}
+
+    rtc::scoped_refptr<VideoFrameBuffer> buffer;
+    absl::optional<VideoFrame::UpdateRect> update_rect;
+  };
+
+  enum class OutputType { kI420, kI420A, kI010, kNV12 };
+  static const char* OutputTypeToString(OutputType type);
+
+  virtual ~FrameGeneratorInterface() = default;
+
+  // Returns VideoFrameBuffer and area where most of update was done to set them
+  // on the VideoFrame object.
+  virtual VideoFrameData NextFrame() = 0;
+
+  // Change the capture resolution.
+  virtual void ChangeResolution(size_t width, size_t height) = 0;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_FRAME_GENERATOR_INTERFACE_H_