Retrieve test data directory at run time

testing/utils/path_service.h

+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TESTING_UTILS_PATH_SERVICE_H_
+#define TESTING_UTILS_PATH_SERVICE_H_
+
+#include <string>
+
+#ifdef _WIN32
+#define PATH_SEPARATOR '\\'
+#else
+#define PATH_SEPARATOR '/'
+#endif
+
+// Get the various file directory and path information.
+class PathService {
+ public:
+  static bool EndsWithSeparator(const std::string& path);

[Lei Zhang, 2015/11/07 01:48:51]

Comments please.

[Wei Li, 2015/11/07 02:36:12]

Done.

+  static bool GetExecutableDir(std::string* path);

[Lei Zhang, 2015/11/07 01:48:51]

Can this return a string, with an empty string as the sentinel value for
failure?

Ditto below.

[Wei Li, 2015/11/07 02:36:12]

Yes, it can. But we would need to write special comments while the current one
may be more intuitive about the purposes of input/return. WDYT? 

[Lei Zhang, 2015/11/07 02:43:30]

We use it in a few places. In some ways it's easier because there's no
parameters to deal with. I don't have strong feelings.

[Wei Li, 2015/11/09 18:08:19]

Acknowledged.

+  static bool GetSourceDir(std::string* path);
+  static bool GetTestDataDir(std::string* path);
+  // Get the full path for a test file under the test data directory.
+  static bool GetTestFilePath(const std::string& file_name, std::string* path);
+};
+#endif  // TESTING_UTILS_PATH_SERVICE_H_