Fix for rebaseline-cl --only-changed-tests: use hard-coded constant layout test dir.

third_party/WebKit/Tools/Scripts/webkitpy/common/webkit_finder.py

 # Copyright (c) 2012 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 70 matching lines @@
 
     def layout_tests_dir(self):
         return self.path_from_webkit_base('LayoutTests')
 
     def perf_tests_dir(self):
         return self.path_from_webkit_base('PerformanceTests')
 
     def layout_test_name(self, file_path):
         """Returns a layout test name, given the path from the repo root.
 
+        Note: this appears to not work on Windows; see crbug.com/658795.
+        Also, this function duplicates functionality that's in
+        Port.relative_test_filename.
+        TODO(qyearsley): De-duplicate this and Port.relative_test_filename,
+        and ensure that it works properly with Windows paths.
+
         Args:
             file_path: A relative path from the root of the Chromium repo.
 
         Returns:
             The normalized layout test name, which is just the relative path from
             the LayoutTests directory, using forward slash as the path separator.
             Returns None if the given file is not in the LayoutTests directory.
         """
         layout_tests_abs_path = self._filesystem.join(self.webkit_base(), self.layout_tests_dir())
         layout_tests_rel_path = self._filesystem.relpath(layout_tests_abs_path, self.chromium_base())
@@ skipping 21 matching lines @@
         prev_dir = ''
         current_dir = fs.dirname(self._webkit_base)
         while current_dir != prev_dir:
             if fs.exists(fs.join(current_dir, 'depot_tools', 'pylint.py')):
                 return fs.join(current_dir, 'depot_tools')
             prev_dir = current_dir
             current_dir = fs.dirname(current_dir)
 
     def path_from_depot_tools_base(self, *comps):
         return self._filesystem.join(self.depot_tools_base(), *comps)