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diff --git a/third_party/libwebrtc/test/logging/memory_log_writer.h b/third_party/libwebrtc/test/logging/memory_log_writer.h
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+++ b/third_party/libwebrtc/test/logging/memory_log_writer.h
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+/*
+ *  Copyright 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_LOGGING_MEMORY_LOG_WRITER_H_
+#define TEST_LOGGING_MEMORY_LOG_WRITER_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "test/logging/log_writer.h"
+
+namespace webrtc {
+
+// Allows creating log writer factories that creates log writers that saves
+// their content to memory. When the log writers are destroyed, their content is
+// saved to the logs_ member of this class. The intended usage is to keep this
+// class alive after the created factories and writers have been destroyed and
+// then use logs() to access all the saved logs.
+class MemoryLogStorage {
+ public:
+  MemoryLogStorage();
+  ~MemoryLogStorage();
+  std::unique_ptr<LogWriterFactoryInterface> CreateFactory();
+  const std::map<std::string, std::string>& logs() { return logs_; }
+
+ private:
+  std::map<std::string, std::string> logs_;
+};
+
+}  // namespace webrtc
+
+#endif  // TEST_LOGGING_MEMORY_LOG_WRITER_H_