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diff --git a/third_party/libwebrtc/test/testsupport/test_artifacts.h b/third_party/libwebrtc/test/testsupport/test_artifacts.h
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+++ b/third_party/libwebrtc/test/testsupport/test_artifacts.h
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+/*
+ *  Copyright (c) 2016 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_TESTSUPPORT_TEST_ARTIFACTS_H_
+#define TEST_TESTSUPPORT_TEST_ARTIFACTS_H_
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <string>
+
+namespace webrtc {
+namespace test {
+
+// If the test_artifacts_dir flag is set, returns true and copies the location
+// of the dir to `out_dir`. Otherwise, return false.
+bool GetTestArtifactsDir(std::string* out_dir);
+
+// Writes a `length` bytes array `buffer` to `filename` in isolated output
+// directory defined by swarming. If the file is existing, content will be
+// appended. Otherwise a new file will be created. This function returns false
+// if isolated output directory has not been defined, or `filename` indicates an
+// invalid or non-writable file, or underlying file system errors.
+bool WriteToTestArtifactsDir(const char* filename,
+                             const uint8_t* buffer,
+                             size_t length);
+
+bool WriteToTestArtifactsDir(const char* filename, const std::string& content);
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_TESTSUPPORT_TEST_ARTIFACTS_H_