Create an external source for extensions on linux that meets the needs of package managers.

chrome/chrome_browser_extensions.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 338 matching lines @@
         'browser/extensions/extension_webkit_preferences.h',
         'browser/extensions/extensions_quota_service.cc',
         'browser/extensions/extensions_quota_service.h',
         'browser/extensions/extensions_startup.cc',
         'browser/extensions/extensions_startup.h',
         'browser/extensions/external_extension_loader.cc',
         'browser/extensions/external_extension_loader.h',
         'browser/extensions/external_extension_provider_impl.cc',
         'browser/extensions/external_extension_provider_impl.h',
         'browser/extensions/external_extension_provider_interface.h',
+        'browser/extensions/external_extension_util.cc',
+        'browser/extensions/external_extension_util.h',
+        'browser/extensions/external_filesystem_extension_loader_linux.cc',
+        'browser/extensions/external_filesystem_extension_loader_linux.h',
         'browser/extensions/external_policy_extension_loader.cc',
         'browser/extensions/external_policy_extension_loader.h',
         'browser/extensions/external_pref_extension_loader.cc',
         'browser/extensions/external_pref_extension_loader.h',
         'browser/extensions/external_registry_extension_loader_win.cc',
         'browser/extensions/external_registry_extension_loader_win.h',
         'browser/extensions/file_reader.cc',
         'browser/extensions/file_reader.h',
         'browser/extensions/image_loading_tracker.cc',
         'browser/extensions/image_loading_tracker.h',
@@ skipping 270 matching lines @@
                 }],
               ],
             }],
           ],
         }],
       ],
     },
   ],
 }