In rebaseline-cl: add option to only rebaseline tests changed in the CL.

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 32 matching lines @@
 
     def webkit_base(self):
         """Returns the absolute path to the top of the WebKit tree.
 
         Raises an AssertionError if the top dir can't be determined."""
         # Note: This code somewhat duplicates the code in
         # scm.find_checkout_root(). However, that code only works if the top
         # of the SCM repository also matches the top of the WebKit tree. Some SVN users
         # (the chromium test bots, for example), might only check out subdirectories like
         # Tools/Scripts. This code will also work if there is no SCM system at all.
+        # TODO(qyearsley): Remove duplicate code; we're not concerned with SVN users anymore.
+        # Also, instead of caching the result with a private instance variable, we can use
+        # the memoized decorator.
         if not self._webkit_base:
             self._webkit_base = self._webkit_base
             module_path = self._filesystem.abspath(self._filesystem.path_to_module(self.__module__))
             tools_index = module_path.rfind('Tools')
             assert tools_index != -1, "could not find location of this checkout from %s" % module_path
             self._webkit_base = self._filesystem.normpath(module_path[0:tools_index - 1])
         return self._webkit_base
 
     def chromium_base(self):
         if not self._chromium_base:
@@ skipping 11 matching lines @@
         # This is intentionally relative in order to force callers to consider what
         # their current working directory is (and change to the top of the tree if necessary).
         return self._filesystem.join("Tools", "Scripts", script_name)
 
     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.
+
+        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())
+        if not file_path.startswith(layout_tests_rel_path):
+            return None
+        return file_path[len(layout_tests_rel_path) + 1:]
+
     def depot_tools_base(self):
         if not self._depot_tools:
             # This basically duplicates src/build/find_depot_tools.py without the side effects
             # (adding the directory to sys.path and importing breakpad).
             self._depot_tools = (self._check_paths_for_depot_tools(self._sys_path) or
                                  self._check_paths_for_depot_tools(self._env_path) or
                                  self._check_upward_for_depot_tools())
         return self._depot_tools
 
     def _check_paths_for_depot_tools(self, paths):
         for path in paths:
             if path.rstrip(self._dirsep).endswith('depot_tools'):
                 return path
         return None
 
     def _check_upward_for_depot_tools(self):
         fs = self._filesystem
         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)