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diff --git a/third_party/libwebrtc/api/audio/echo_canceller3_config_json.h b/third_party/libwebrtc/api/audio/echo_canceller3_config_json.h
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+++ b/third_party/libwebrtc/api/audio/echo_canceller3_config_json.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_AUDIO_ECHO_CANCELLER3_CONFIG_JSON_H_
+#define API_AUDIO_ECHO_CANCELLER3_CONFIG_JSON_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "api/audio/echo_canceller3_config.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+// Parses a JSON-encoded string into an Aec3 config. Fields corresponds to
+// substruct names, with the addition that there must be a top-level node
+// "aec3". Produces default config values for anything that cannot be parsed
+// from the string. If any error was found in the parsing, parsing_successful is
+// set to false.
+RTC_EXPORT void Aec3ConfigFromJsonString(absl::string_view json_string,
+                                         EchoCanceller3Config* config,
+                                         bool* parsing_successful);
+
+// To be deprecated.
+// Parses a JSON-encoded string into an Aec3 config. Fields corresponds to
+// substruct names, with the addition that there must be a top-level node
+// "aec3". Returns default config values for anything that cannot be parsed from
+// the string.
+RTC_EXPORT EchoCanceller3Config
+Aec3ConfigFromJsonString(absl::string_view json_string);
+
+// Encodes an Aec3 config in JSON format. Fields corresponds to substruct names,
+// with the addition that the top-level node is named "aec3".
+RTC_EXPORT std::string Aec3ConfigToJsonString(
+    const EchoCanceller3Config& config);
+
+}  // namespace webrtc
+
+#endif  // API_AUDIO_ECHO_CANCELLER3_CONFIG_JSON_H_