Add test to check all current accelerators having keyboard overlay.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Chrome OS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 4707 matching lines @@
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_RESET_SCREEN_ZOOM" desc="The text in the keyboard overlay to explain the shortcut (reset the screen zoom).">
     Reset screen zoom
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_RESET_ZOOM" desc="The text in the keyboard overlay to explain the shortcut.">
     Reset zoom
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_ROTATE_SCREEN" desc="The text in the keyboard overlay to explain the shortcut (rotate the screen).">
     Rotate screen
   </message>
+  <message name="IDS_KEYBOARD_OVERLAY_ROTATE_WINDOW" desc="The text in the keyboard overlay to explain the shortcut (rotate the window).">
+    Rotate window
+  </message>
   <message name="IDS_KEYBOARD_OVERLAY_SAVE" desc="The text in the keyboard overlay to explain the shortcut (save page as a file).">
     Save
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_SCREENSHOT_REGION" desc="The text in the keyboard overlay to explain the shortcut (take a screenshot of the selected region).">
     Screenshot region
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_SCREENSHOT_WINDOW" desc="The text in the keyboard overlay to explain the shortcut.">
     Screenshot window
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_SCROLL_UP_ONE_PAGE" desc="The text in the keyboard overlay to explain the shortcut.">
@@ skipping 10 matching lines @@
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_SHOW_IME_BUBBLE" desc="The text in the keyboard overlay to explain the shortcut (Show the input options menu bubble).">
     Input options bubble
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_SHOW_MESSAGE_CENTER" desc="The text in the keyboard overlay to explain the shortcut (Show the message center).">
     Message center
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_SHOW_STATUS_MENU" desc="The text in the keyboard overlay to explain the shortcut (show the status menu).">
     Status menu
   </message>
+  <message name="IDS_KEYBOARD_OVERLAY_SHOW_STYLUS_TOOLS" desc="The text in the keyboard overlay to explain the shortcut (show the stylus tools).">
+    Stylus tools
+  </message>
   <message name="IDS_KEYBOARD_OVERLAY_SIGN_OUT" desc="The text in the keyboard overlay to explain the shortcut.">
     Sign out
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_SUSPEND" desc="The text in the keyboard overlay to explain the shortcut.">
     Suspend
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_SWAP_PRIMARY_MONITOR" desc="The text in the keyboard overlay to explain the shortcut (swap primary monitor).">
     Swap primary monitor
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_TAKE_SCREENSHOT" desc="The text in the keyboard overlay to explain the shortcut.">
@@ skipping 16 matching lines @@
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_TOGGLE_HIGH_CONTRAST_MODE" desc="The text in the keyboard overlay to explain the shortcut (Toggle high contrast mode).">
     Toggle High Contrast Mode
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_TOGGLE_PROJECTION_TOUCH_HUD" desc="The text in the keyboard overlay to explain the shortcut.">
     Projection touch HUD
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_TOGGLE_SPEECH_INPUT" desc="The text in the keyboard overlay to explain the shortcut (start or stop speech input).">
     Speech input
   </message>
+  <message name="IDS_KEYBOARD_OVERLAY_TOUCH_HUD_MODE_CHANGE" desc="The text in the keyboard overlay to explain the shortcut (touch hub mode change).">
+    Touch HUD mode change
+  </message>
   <message name="IDS_KEYBOARD_OVERLAY_UNDO" desc="The text in the keyboard overlay to explain the shortcut.">
     Undo
   </message>
+  <message name="IDS_KEYBOARD_OVERLAY_UNPIN" desc="The text in the keyboard overlay to explain the shortcut.">
+    Unpin
+  </message>
   <message name="IDS_KEYBOARD_OVERLAY_VIEW_KEYBOARD_OVERLAY" desc="The text in the keyboard overlay to explain the shortcut.">
     Keyboard overlay
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_VIEW_SOURCE" desc="The text in the keyboard overlay to explain the shortcut.">
     View source
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_WORD_MOVE" desc="The text in the keyboard overlay to explain the shortcut.">
     Word move
   </message>
   <message name="IDS_KEYBOARD_OVERLAY_ZOOM_IN" desc="The text in the keyboard overlay to explain the shortcut.">
@@ skipping 1805 matching lines @@
     Attempts left: $1
   </message>
   <message name="IDS_REQUEST_PIN_DIALOG_PIN" desc="The Provider Identification Number abbreviation">
     PIN
   </message>
   <message name="IDS_REQUEST_PIN_DIALOG_PUK" desc="The Personal Unlocking Key (as used in mobile phones) abbreviation">
     PUK
   </message>
 
 </grit-part>