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diff --git a/third_party/libwebrtc/test/call_config_utils.h b/third_party/libwebrtc/test/call_config_utils.h
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+++ b/third_party/libwebrtc/test/call_config_utils.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 TEST_CALL_CONFIG_UTILS_H_
+#define TEST_CALL_CONFIG_UTILS_H_
+
+#include "call/video_receive_stream.h"
+#include "rtc_base/strings/json.h"
+
+namespace webrtc {
+namespace test {
+
+// Deserializes a JSON representation of the VideoReceiveStreamInterface::Config
+// back into a valid object. This will not initialize the decoders or the
+// renderer.
+VideoReceiveStreamInterface::Config ParseVideoReceiveStreamJsonConfig(
+    webrtc::Transport* transport,
+    const Json::Value& json);
+
+// Serialize a VideoReceiveStreamInterface::Config into a Json object.
+Json::Value GenerateVideoReceiveStreamJsonConfig(
+    const VideoReceiveStreamInterface::Config& config);
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_CALL_CONFIG_UTILS_H_