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diff --git a/third_party/libwebrtc/api/test/video/function_video_decoder_factory.h b/third_party/libwebrtc/api/test/video/function_video_decoder_factory.h
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+/*
+ *  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_TEST_VIDEO_FUNCTION_VIDEO_DECODER_FACTORY_H_
+#define API_TEST_VIDEO_FUNCTION_VIDEO_DECODER_FACTORY_H_
+
+#include <functional>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "api/video_codecs/sdp_video_format.h"
+#include "api/video_codecs/video_decoder.h"
+#include "api/video_codecs/video_decoder_factory.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+namespace test {
+
+// A decoder factory producing decoders by calling a supplied create function.
+class FunctionVideoDecoderFactory final : public VideoDecoderFactory {
+ public:
+  explicit FunctionVideoDecoderFactory(
+      std::function<std::unique_ptr<VideoDecoder>()> create)
+      : create_([create = std::move(create)](const SdpVideoFormat&) {
+          return create();
+        }) {}
+  explicit FunctionVideoDecoderFactory(
+      std::function<std::unique_ptr<VideoDecoder>(const SdpVideoFormat&)>
+          create)
+      : create_(std::move(create)) {}
+  FunctionVideoDecoderFactory(
+      std::function<std::unique_ptr<VideoDecoder>()> create,
+      std::vector<SdpVideoFormat> sdp_video_formats)
+      : create_([create = std::move(create)](const SdpVideoFormat&) {
+          return create();
+        }),
+        sdp_video_formats_(std::move(sdp_video_formats)) {}
+
+  std::vector<SdpVideoFormat> GetSupportedFormats() const override {
+    return sdp_video_formats_;
+  }
+
+  std::unique_ptr<VideoDecoder> CreateVideoDecoder(
+      const SdpVideoFormat& format) override {
+    return create_(format);
+  }
+
+ private:
+  const std::function<std::unique_ptr<VideoDecoder>(const SdpVideoFormat&)>
+      create_;
+  const std::vector<SdpVideoFormat> sdp_video_formats_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_VIDEO_FUNCTION_VIDEO_DECODER_FACTORY_H_