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diff --git a/third_party/libwebrtc/test/testsupport/file_utils_override.h b/third_party/libwebrtc/test/testsupport/file_utils_override.h
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+++ b/third_party/libwebrtc/test/testsupport/file_utils_override.h
@@ -0,0 +1,57 @@
+/*
+ *  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 TEST_TESTSUPPORT_FILE_UTILS_OVERRIDE_H_
+#define TEST_TESTSUPPORT_FILE_UTILS_OVERRIDE_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace webrtc {
+namespace test {
+namespace internal {
+
+// Returns the absolute path to the output directory where log files and other
+// test artifacts should be put. The output directory is generally a directory
+// named "out" at the project root. This root is assumed to be two levels above
+// where the test binary is located; this is because tests execute in a dir
+// out/Whatever relative to the project root. This convention is also followed
+// in Chromium.
+//
+// The exception is Android where we use /sdcard/ instead.
+//
+// If symbolic links occur in the path they will be resolved and the actual
+// directory will be returned.
+//
+// Returns the path WITH a trailing path delimiter. If the project root is not
+// found, the current working directory ("./") is returned as a fallback.
+std::string OutputPath();
+
+// Gets the current working directory for the executing program.
+// Returns "./" if for some reason it is not possible to find the working
+// directory.
+std::string WorkingDir();
+
+// Returns a full path to a resource file in the resources_dir dir.
+//
+// Arguments:
+//    name - Name of the resource file. If a plain filename (no directory path)
+//           is supplied, the file is assumed to be located in resources/
+//           If a directory path is prepended to the filename, a subdirectory
+//           hierarchy reflecting that path is assumed to be present.
+//    extension - File extension, without the dot, i.e. "bmp" or "yuv".
+std::string ResourcePath(absl::string_view name, absl::string_view extension);
+
+}  // namespace internal
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_TESTSUPPORT_FILE_UTILS_OVERRIDE_H_