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diff --git a/third_party/libwebrtc/webrtc/test/testsupport/fileutils.h b/third_party/libwebrtc/webrtc/test/testsupport/fileutils.h
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+/*
+ *  Copyright (c) 2011 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.
+ */
+
+#include <stdio.h>
+
+#ifndef TEST_TESTSUPPORT_FILEUTILS_H_
+#define TEST_TESTSUPPORT_FILEUTILS_H_
+
+#include <string>
+#include <vector>
+
+#include "api/optional.h"
+
+namespace webrtc {
+namespace test {
+
+// This is the "directory" returned if the ProjectPath() function fails
+// to find the project root.
+extern const char* kCannotFindProjectRootDir;
+
+// Creates and 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 top-level of the project, i.e. a subfolder to
+// the path returned by ProjectRootPath(). 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();
+
+// Generates an empty file with a unique name in the specified directory and
+// returns the file name and path.
+std::string TempFilename(const std::string &dir, const std::string &prefix);
+
+// Returns a path to a resource file for the currently executing platform.
+// Adapts to what filenames are currently present in the
+// [project-root]/resources/ dir.
+// Returns an absolute path according to this priority list (the directory
+// part of the path is left out for readability):
+// 1. [name]_[platform]_[architecture].[extension]
+// 2. [name]_[platform].[extension]
+// 3. [name]_[architecture].[extension]
+// 4. [name].[extension]
+// Where
+// * platform is either of "win", "mac" or "linux".
+// * architecture is either of "32" or "64".
+//
+// 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(const std::string& name,
+                         const std::string& extension);
+
+// 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();
+
+// Reads the content of a directory and, in case of success, returns a vector
+// of strings with one element for each found file or directory. Each element is
+// a path created by prepending |dir| to the file/directory name. "." and ".."
+// are never added in the returned vector.
+rtc::Optional<std::vector<std::string>> ReadDirectory(std::string path);
+
+// Creates a directory if it not already exists.
+// Returns true if successful. Will print an error message to stderr and return
+// false if a file with the same name already exists.
+bool CreateDir(const std::string& directory_name);
+
+// Removes a directory, which must already be empty.
+bool RemoveDir(const std::string& directory_name);
+
+// Removes a file.
+bool RemoveFile(const std::string& file_name);
+
+// Checks if a file exists.
+bool FileExists(const std::string& file_name);
+
+// Checks if a directory exists.
+bool DirExists(const std::string& directory_name);
+
+// File size of the supplied file in bytes. Will return 0 if the file is
+// empty or if the file does not exist/is readable.
+size_t GetFileSize(const std::string& filename);
+
+// Sets the executable path, i.e. the path to the executable that is being used
+// when launching it. This is usually the path relative to the working directory
+// but can also be an absolute path. The intention with this function is to pass
+// the argv[0] being sent into the main function to make it possible for
+// fileutils.h to find the correct project paths even when the working directory
+// is outside the project tree (which happens in some cases).
+void SetExecutablePath(const std::string& path_to_executable);
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_TESTSUPPORT_FILEUTILS_H_