Add the Copresence API.

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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.
 
 {
   'variables': {
     # These variables are shared with the GN build.
     # Name is that these are the extensions files for the extensions target.
     # "chrome_browser_extensions_sources' are the extensions files in the
     # browser target.
@@ skipping 467 matching lines @@
       'browser/extensions/api/context_menus/context_menus_api.cc',
       'browser/extensions/api/context_menus/context_menus_api.h',
       'browser/extensions/api/context_menus/context_menus_api_helpers.cc',
       'browser/extensions/api/context_menus/context_menus_api_helpers.h',
       'browser/extensions/api/cookies/cookies_api.cc',
       'browser/extensions/api/cookies/cookies_api.h',
       'browser/extensions/api/cookies/cookies_api_constants.cc',
       'browser/extensions/api/cookies/cookies_api_constants.h',
       'browser/extensions/api/cookies/cookies_helpers.cc',
       'browser/extensions/api/cookies/cookies_helpers.h',
+      'browser/extensions/api/copresence/copresence_api.cc',
+      'browser/extensions/api/copresence/copresence_api.h',
+      'browser/extensions/api/copresence/copresence_translations.cc',
+      'browser/extensions/api/copresence/copresence_translations.h',
+      'browser/extensions/api/copresence/copresence_util.cc',
+      'browser/extensions/api/copresence/copresence_util.h',
       'browser/extensions/api/copresence_private/copresence_private_api.cc',
       'browser/extensions/api/copresence_private/copresence_private_api.h',
       'browser/extensions/api/debugger/debugger_api.cc',
       'browser/extensions/api/debugger/debugger_api.h',
       'browser/extensions/api/debugger/debugger_api_constants.cc',
       'browser/extensions/api/debugger/debugger_api_constants.h',
       'browser/extensions/api/declarative/declarative_api.cc',
       'browser/extensions/api/declarative/declarative_api.h',
       'browser/extensions/api/declarative/declarative_rule.h',
       'browser/extensions/api/declarative/deduping_factory.h',
@@ skipping 695 matching lines @@
         }],
         ['enable_app_list==1', {
           'sources': [
             '<@(chrome_browser_extensions_app_list_sources)',
           ],
         }]
       ],
     },
   ],
 }