Add a button on status bar to indicate that accessibility is enabled.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 12140 matching lines @@
         fast
       </message>
       <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_XKB_KEY_REPEAT_SPEED_FAST"
                desc="The label for the Chrome OS configuration dialog">
         fast
       </message>
       <message name="IDS_OPTIONS_SETTINGS_LANGUAGES_XKB_KEY_REPEAT_SPEED_FAST"
                desc="The label for the Chrome OS configuration dialog">
         fast
       </message>
+      <message name="IDS_STATUSBAR_ACCESSIBILITY_ENABLED" desc="The tooltip for the status bar button to indicate that accessibility is enabled.">
+        Accessibility features are enabled.
+      </message>
       <message name="IDS_STATUSBAR_NETWORK_LOCKED" desc="Message displayed while access to network devices is temporarily locked due to mobile network activation">
         Please wait while we set up your mobile network.
       </message>
       <message name="IDS_STATUSBAR_NETWORK_DEVICE_ETHERNET" desc="The ethernet network device.">
         Ethernet
       </message>
       <message name="IDS_STATUSBAR_NETWORK_DEVICE_WIFI" desc="The wifi network device.">
         Wi-Fi
       </message>
       <message name="IDS_STATUSBAR_NETWORK_DEVICE_CELLULAR" desc="The cellular network device.">
@@ skipping 1353 matching lines @@
       </if>
     </includes>
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
   </release>
 </grit>