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diff --git a/third_party/libwebrtc/test/scenario/column_printer.h b/third_party/libwebrtc/test/scenario/column_printer.h
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+++ b/third_party/libwebrtc/test/scenario/column_printer.h
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+/*
+ *  Copyright 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 TEST_SCENARIO_COLUMN_PRINTER_H_
+#define TEST_SCENARIO_COLUMN_PRINTER_H_
+#include <functional>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "rtc_base/strings/string_builder.h"
+#include "test/logging/log_writer.h"
+
+namespace webrtc {
+namespace test {
+class ColumnPrinter {
+ public:
+  ColumnPrinter(const ColumnPrinter&);
+  ~ColumnPrinter();
+  static ColumnPrinter Fixed(const char* headers, std::string fields);
+  static ColumnPrinter Lambda(
+      const char* headers,
+      std::function<void(rtc::SimpleStringBuilder&)> printer,
+      size_t max_length = 256);
+
+ protected:
+  friend class StatesPrinter;
+  const char* headers_;
+  std::function<void(rtc::SimpleStringBuilder&)> printer_;
+  size_t max_length_;
+
+ private:
+  ColumnPrinter(const char* headers,
+                std::function<void(rtc::SimpleStringBuilder&)> printer,
+                size_t max_length);
+};
+
+class StatesPrinter {
+ public:
+  StatesPrinter(std::unique_ptr<RtcEventLogOutput> writer,
+                std::vector<ColumnPrinter> printers);
+
+  ~StatesPrinter();
+
+  StatesPrinter(const StatesPrinter&) = delete;
+  StatesPrinter& operator=(const StatesPrinter&) = delete;
+
+  void PrintHeaders();
+  void PrintRow();
+
+ private:
+  const std::unique_ptr<RtcEventLogOutput> writer_;
+  const std::vector<ColumnPrinter> printers_;
+  size_t buffer_size_ = 0;
+  std::vector<char> buffer_;
+};
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_SCENARIO_COLUMN_PRINTER_H_