Move PathService's DIR_LAYOUT_TESTS from chrome to content

content/public/common/content_paths.h

 // Copyright (c) 2012 The Chromium 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 CONTENT_PUBLIC_COMMON_CONTENT_PATHS_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_PATHS_H_
 #pragma once
 
 #include "content/common/content_export.h"
 
 // This file declares path keys for the content module.  These can be used with
 // the PathService to access various special directories and files.
 
 namespace content {
 
 enum {
   PATH_START = 4000,
 
   // Path and filename to the executable to use for child processes.
   CHILD_PROCESS_EXE = PATH_START,
 
   // Valid only in development environment
   DIR_TEST_DATA,
 
   // Directory where the Media libraries reside.
   DIR_MEDIA_LIBS,
+  // Returns the LayoutTests path for layout tests. For the current git
+  // workflow, it returns
+  //   third_party/WebKit/LayoutTests
+  // On svn workflow (including build machines) and older git workflow, it
+  // returns
+  //   content/test/data/layout_tests/LayoutTests
+  // See http://crbug.com/105104.
+  DIR_LAYOUT_TESTS,
 
   PATH_END
 };
 
 // Call once to register the provider for the path keys defined above.
 CONTENT_EXPORT void RegisterPathProvider();
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_PATHS_H_