A11y: Add the option to always show the a11y tray menu regardless of the state of a11y features

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="pp_ifdef('chromeos')">. -->
 <grit-part>
   <!-- Idle Logout Dialog Strings -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog">
     Are you still there?
   </message>
   <message name="IDS_IDLE_LOGOUT_WARNING_RESTART" desc="Restart label for the idle logout dialog">
     This computer will reset in <ph name="LOGOUT_TIME_LEFT">$1<ex>20</ex></ph> seconds.
@@ skipping 709 matching lines @@
   </message>
   <message name="IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SCREEN_MAGNIFIER_PARTIAL" desc="In the settings tab, the option indication the screen magnifier is set to partial.">
     Partial
   </message>
   <message name="IDS_OPTIONS_SETTINGS_ACCESSIBILITY_TOUCHPAD_TAP_DRAGGING_DESCRIPTION" desc="In the settings tab, the text next to the checkbox for tap dragging.">
     Enable tap dragging
   </message>
   <message name="IDS_OPTIONS_SETTINGS_ACCESSIBILITY_VIRTUAL_KEYBOARD_DESCRIPTION" desc="In the settings tab, the text next to the checkbox for virtual keyboard.">
     Enable virtual keyboard
   </message>
+  <message name="IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SHOULD_ALWAYS_SHOW_MENU" desc="In the settings tab, the text next to the checkbox to show the accessibility tray menu regardless of the state of a11y features.">
+    Enable accessibility menu
+  </message>
   <message name="IDS_OPTIONS_SETTINGS_DISPLAY_OPTIONS_BUTTON_LABEL" desc="Label for the button opening display settings tab.">
     Display settings
   </message>
   <message name="IDS_OPTIONS_SETTINGS_DISPLAY_OPTIONS_TAB_TITLE" desc="Title for the display settings tab.">
     Manage displays
   </message>
   <message name="IDS_OPTIONS_SETTINGS_DISPLAY_OPTIONS_START_MIRRORING" desc="Button label to start display mirroring.">
     Start mirroring
   </message>
   <message name="IDS_OPTIONS_SETTINGS_DISPLAY_OPTIONS_STOP_MIRRORING" desc="Button label to stop display mirroring.">
@@ skipping 2702 matching lines @@
   <message name="IDS_LOGIN_MANAGED_BY_STATUS_NETWORK_ERROR" desc="Text for the network error status in 'Managed by DOMAIN' label on login screen.">
     Network error while communicating with the device management service.
   </message>
   <message name="IDS_LOGIN_MANAGED_BY_NOTICE" desc="Text for the notification bar on the login screen showing that this is a managed device.">
     This device is managed by <ph name="DOMAIN">$1<ex>yourdomain.com</ex></ph>.
   </message>
   <message name="IDS_LOGIN_MANAGED_REPORTING_HINT" desc="Text for the hint on reporting features displayed in the enterprise notification bar on the login screen.">
     Device usage may be tracked.
   </message>
 </grit-part>