Add display scaling and rotation shortcuts to keyboard overlay.

chrome/app/chromeos_strings.grdp

Index: chrome/app/chromeos_strings.grdp
diff --git a/chrome/app/chromeos_strings.grdp b/chrome/app/chromeos_strings.grdp
index ed07fcc223a2522abcc197b3612d03eb619f32cd..5b4e0357526b3eba3d7088093da4e2d1aa726a6b 100644
--- a/chrome/app/chromeos_strings.grdp
+++ b/chrome/app/chromeos_strings.grdp
@@ -2990,9 +2990,15 @@ Battery full
   <message name="IDS_KEYBOARD_OVERLAY_REPORT_ISSUE" desc="The text in the keyboard overlay to explain the shortcut (report an issue).">
     Report issue
   </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_SAVE" desc="The text in the keyboard overlay to explain the shortcut (save page as a file).">
     Save
   </message>
@@ -3059,6 +3065,12 @@ Battery full
   <message name="IDS_KEYBOARD_OVERLAY_ZOOM_OUT" desc="The text in the keyboard overlay to explain the shortcut.">
     Zoom out
   </message>
+  <message name="IDS_KEYBOARD_OVERLAY_ZOOM_SCREEN_IN" desc="The text in the keyboard overlay to explain the shortcut (zoom in the screen).">
+    Zoom screen in
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_ZOOM_SCREEN_OUT" desc="The text in the keyboard overlay to explain the shortcut (zoom out the screen).">
+    Zoom screen out
+  </message>
   <!-- END GENERATED KEYBOARD OVERLAY STRINGS -->
   <if expr="lang == 'ja'">
     <message name="IDS_STATUSBAR_IME_JAPANESE_IME_STATUS_HIRAGANA" desc="In the language menu button, this shows a character set in use is set to Hiragana.">