Add an accessibility API for events raised outside of the web content.

chrome/chrome_common.gypi

 # Copyright (c) 2010 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.
 
 {
   'target_defaults': {
     'variables': {
       'chrome_common_target': 0,
     },
     'target_conditions': [
@@ skipping 16 matching lines @@
               'common/hi_res_timer_manager.cc',
               'common/hi_res_timer_manager.h',
               'common/temp_scaffolding_stubs.cc',
             ],
           }],
         ],
         'sources': [
           # .cc, .h, and .mm files under chrome/common that are used on all
           # platforms, including both 32-bit and 64-bit Windows.
           # Test files are not included.
+          'common/accessibility_events.h',
+          'common/accessibility_events.cc',
           'common/bindings_policy.h',
           'common/child_process.cc',
           'common/child_process.h',
           'common/child_process_info.cc',
           'common/child_process_info.h',
           'common/child_process_logging.h',
           'common/child_process_logging_linux.cc',
           'common/child_process_logging_mac.mm',
           'common/child_process_logging_win.cc',
           'common/child_thread.cc',
@@ skipping 332 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }