Allow DCI to pick up contents from Internet Plug-Ins on OS X.

components/component_updater/component_updater_paths.h

 // Copyright 2014 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 COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_PATHS_H_
 #define COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_PATHS_H_
 
 #include "base/files/file_path.h"
 
 namespace component_updater {
 
 extern const base::FilePath::CharType kSupervisedUserWhitelistDirName[];
 
 enum {
   PATH_START = 10000,
   DIR_COMPONENT_PREINSTALLED = PATH_START,  // Directory that contains component
                                             // implementations installed by the
                                             // Chrome installer or package
                                             // manager.
+  DIR_COMPONENT_PREINSTALLED_ALT,           // A second preinstalled directory,
+                                            // necessary because some components
+                                            // live in a distinct directory on
+                                            // OS X. On other platforms, this
+                                            // ultimately is equivalent to
+                                            // DIR_COMPONENT_PREINSTALLED.
   DIR_COMPONENT_USER,                       // Directory that contains user-wide
                                             // (component-updater-installer)
                                             // component implementations.
   // The following paths live in the user directory only, and point to the base
   // installation directory for the component.
   DIR_COMPONENT_CLD2,              // The Compact Language Detector.
   DIR_RECOVERY_BASE,               // The Recovery.
   DIR_SWIFT_SHADER,                // The SwiftShader.
   DIR_SUPERVISED_USER_WHITELISTS,  // The Supervised user whitelists.
   PATH_END
 };
 
 // Call once to register the provider for the path keys defined above.
 // |components_system_root_key| is the path provider key defining where bundled
 // components are already installed system-wide.
 // |components_user_root_key| is the path provider key defining where the
 // component updater should install new versions of components.
 void RegisterPathProvider(int components_system_root_key,
+                          int components_system_root_key_alt,

[Eugene But (OOO till 7-30), 2016/06/22 02:06:34]

Could you please update function comments and explain what
|components_system_root_key_alt| is.

                           int components_user_root_key);
 
 }  // namespace component_updater
 
 #endif  // COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_PATHS_H_