Add the Copresence API.

chrome/common/extensions/api/api.gyp

 # 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.
 
 {
   # All files are stored in these lists which are referenced in the target
   # below so that the GN build of this target can read in this dictionary and
   # duplicate the same logic without the lists getting out-of-sync. The GN
   # .gypi reader can not process conditions and does not know about targets,
   # etc., it just reads Python dictionaries.
@@ skipping 25 matching lines @@
       'bookmark_manager_private.json',
       'bookmarks.json',
       'braille_display_private.idl',
       'browser.idl',
       'cloud_print_private.json',
       'command_line_private.json',
       'content_settings.json',
       'context_menus_internal.json',
       'context_menus.json',
       'cookies.json',
+      'copresence.idl',
       'copresence_private.idl',
       'debugger.json',
       'desktop_capture.json',
       'developer_private.idl',
       'dial.idl',
       'downloads.idl',
       'downloads_internal.idl',
       'easy_unlock_private.idl',
       'echo_private.json',
       'enterprise_platform_keys_private.json',
@@ skipping 166 matching lines @@
       'conditions': [
         ['chromeos==1', {
           'dependencies': [
             '<(DEPTH)/chrome/chrome.gyp:drive_proto',
           ],
         }],
       ],
     },
   ],
 }