Switch AccessibilityMode to be a bitmap

content/content_browser.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.
 
 {
   'dependencies': [
     '../third_party/re2/re2.gyp:re2',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
@@ skipping 187 matching lines @@
     'public/browser/web_ui_controller.cc',
     'public/browser/web_ui_controller.h',
     'public/browser/web_ui_controller_factory.h',
     'public/browser/web_ui_data_source.h',
     'public/browser/url_data_source.cc',
     'public/browser/url_data_source.h',
     'public/browser/web_ui_message_handler.h',
     'public/browser/worker_service.h',
     'public/browser/worker_service_observer.h',
     'public/browser/zygote_host_linux.h',
+    'browser/accessibility/accessibility_mode_helper.cc',
+    'browser/accessibility/accessibility_mode_helper.h',
     'browser/accessibility/accessibility_tree_formatter.cc',
     'browser/accessibility/accessibility_tree_formatter.h',
     'browser/accessibility/accessibility_tree_formatter_android.cc',
     'browser/accessibility/accessibility_tree_formatter_gtk.cc',
     'browser/accessibility/accessibility_tree_formatter_mac.mm',
     'browser/accessibility/accessibility_tree_formatter_utils_win.cc',
     'browser/accessibility/accessibility_tree_formatter_utils_win.h',
     'browser/accessibility/accessibility_tree_formatter_win.cc',
     'browser/accessibility/accessibility_ui.cc',
     'browser/accessibility/accessibility_ui.h',
@@ skipping 1427 matching lines @@
         '../build/linux/system.gyp:dbus',
         '../dbus/dbus.gyp:dbus',
       ],
     }, {  # OS != "linux" or use_dbus==0
       'sources!': [
         'browser/geolocation/wifi_data_provider_linux.cc',
       ],
     }],
   ],
 }