Add keyboard overlay help for the Search key as a Function key extended keyboard shortcuts.

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 cd1f560cc94a0b640adf7440c3f94b16f1f570cd..b28a4150a264065ac973ec6d4f72a02b68f0dcba 100644
--- a/chrome/app/chromeos_strings.grdp
+++ b/chrome/app/chromeos_strings.grdp
@@ -2665,9 +2665,48 @@ Battery full
   <message name="IDS_KEYBOARD_OVERLAY_INSTRUCTIONS" desc="The instructions for the keyboard overlay.">
     Hold Control, Alt, or Shift to see keyboard shortcuts for those modifiers.
   </message>
+  <message name="IDS_KEYBOARD_OVERLAY_INSTRUCTIONS_WITH_SEARCH" desc="The instructions for the keyboard overlay.">
+    Hold Control, Alt, Shift, or Search to see keyboard shortcuts for those modifiers.
+  </message>
   <message name="IDS_KEYBOARD_OVERLAY_INSTRUCTIONS_HIDE" desc="The instruction for hiding the keyboard overlay.">
     Type Ctrl+Alt+/ or Escape to hide
   </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F1" desc="The text in the keyboard overlay to explain the shortcut.">
+    F1
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F2" desc="The text in the keyboard overlay to explain the shortcut.">
+    F2
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F3" desc="The text in the keyboard overlay to explain the shortcut.">
+    F3
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F4" desc="The text in the keyboard overlay to explain the shortcut.">
+    F4
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F5" desc="The text in the keyboard overlay to explain the shortcut.">
+    F5
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F6" desc="The text in the keyboard overlay to explain the shortcut.">
+    F6
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F7" desc="The text in the keyboard overlay to explain the shortcut.">
+    F7
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F8" desc="The text in the keyboard overlay to explain the shortcut.">
+    F8
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F9" desc="The text in the keyboard overlay to explain the shortcut.">
+    F9
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F10" desc="The text in the keyboard overlay to explain the shortcut.">
+    F10
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F11" desc="The text in the keyboard overlay to explain the shortcut.">
+    F11
+  </message>
+  <message name="IDS_KEYBOARD_OVERLAY_F12" desc="The text in the keyboard overlay to explain the shortcut.">
+    F12
+  </message>
   <!-- BEGIN GENERATED KEYBOARD OVERLAY STRINGS -->
   <message name="IDS_KEYBOARD_OVERLAY_ACTIVATE_LAST_LAUNCHER_ITEM" desc="The text in the keyboard overlay to explain the shortcut (Open the last launcher item).">
     Activate last launcher item