Assume ProjectRootPath() equals ../.. in Desktop

webrtc/test/testsupport/fileutils.h

 /*
  *  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.
  */
 
@@ skipping 57 matching lines @@
 
 namespace webrtc {
 namespace test {
 
 // This is the "directory" returned if the ProjectPath() function fails
 // to find the project root.
 extern const char* kCannotFindProjectRootDir;
 
 // Finds the root dir of the project, to be able to set correct paths to
 // resource files used by tests.
-// The implementation is simple: it just looks for the file defined by
-// kProjectRootFileName, starting in the current directory (the working
-// directory) and then steps upward until it is found (or it is at the root of
-// the file system).
+// For desktop, we assume that the project root is two levels above (i.e. the
+// current working directory + /../../)
+// For android, it is assumed to be /sdcard/chromium_tests_root/

[kjellander_webrtc, 2016/09/15 10:04:49]

android -> Android

+// For iOS, this calls IOSOutputPath() in iosfileutils.mm

[kjellander_webrtc, 2016/09/15 10:04:49]

Let's leave out implementation details here. How about:
// For iOS, the resource files are assumed to be included in the test's .app
bundle.

 // If the current working directory is above the project root dir, it will not
 // be found.
 //
 // If symbolic links occur in the path they will be resolved and the actual
 // directory will be returned.
 //
 // Returns the absolute path to the project root dir (usually the trunk dir)
 // WITH a trailing path delimiter.
 // If the project root is not found, the string specified by
 // kCannotFindProjectRootDir is returned.
@@ skipping 58 matching lines @@
 // 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  // WEBRTC_TEST_TESTSUPPORT_FILEUTILS_H_