Enable Search-key modifiers for extended key shortcuts.

chrome/browser/resources/chromeos/keyboard_overlay_data.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var keyboardOverlayData = {
   'inputMethodIdToOverlayId': {
     'm17n:ar:kbd': 'ar',
     'm17n:fa:isiri': 'ar',
     'm17n:hi:itrans': 'hi',
     'm17n:th:kesmanee': 'th',
@@ skipping 15857 matching lines @@
     'u<>CTRL': 'keyboardOverlayViewSource',
     'u<>CTRL<>SHIFT': 'keyboardOverlayInputUnicodeCharacters',
     'up<>ALT': 'keyboardOverlayPageUp',
     'up<>ALT<>CTRL': 'keyboardOverlayHome',
     'v<>CTRL': 'keyboardOverlayPaste',
     'v<>CTRL<>SHIFT': 'keyboardOverlayPasteAsPlainText',
     'w<>CTRL': 'keyboardOverlayCloseTab',
     'w<>CTRL<>SHIFT': 'keyboardOverlayCloseWindow',
     'x<>CTRL': 'keyboardOverlayCut',
     'z<>ALT<>CTRL': 'keyboardOverlayToggleSpokenFeedback',
-    'z<>CTRL': 'keyboardOverlayUndo'
+    'z<>CTRL': 'keyboardOverlayUndo',
+    '1<>SEARCH': 'keyboardOverlayF1',
+    '2<>SEARCH': 'keyboardOverlayF2',
+    '3<>SEARCH': 'keyboardOverlayF3',
+    '4<>SEARCH': 'keyboardOverlayF4',
+    '5<>SEARCH': 'keyboardOverlayF5',
+    '6<>SEARCH': 'keyboardOverlayF6',
+    '7<>SEARCH': 'keyboardOverlayF7',
+    '8<>SEARCH': 'keyboardOverlayF8',
+    '9<>SEARCH': 'keyboardOverlayF9',
+    '0<>SEARCH': 'keyboardOverlayF10',
+    '-<>SEARCH': 'keyboardOverlayF11',
+    '=<>SEARCH': 'keyboardOverlayF12',
+    'F1<>SEARCH': 'keyboardOverlayF1',
+    'F2<>SEARCH': 'keyboardOverlayF2',
+    'F3<>SEARCH': 'keyboardOverlayF3',
+    'F4<>SEARCH': 'keyboardOverlayF4',
+    'F5<>SEARCH': 'keyboardOverlayF5',
+    'F6<>SEARCH': 'keyboardOverlayF6',
+    'F7<>SEARCH': 'keyboardOverlayF7',
+    'F8<>SEARCH': 'keyboardOverlayF8',
+    'F9<>SEARCH': 'keyboardOverlayF9',
+    'F10<>SEARCH': 'keyboardOverlayF10',
+    'F11<>SEARCH': 'keyboardOverlayF11',
+    'F12<>SEARCH': 'keyboardOverlayF12',
+    'back<>SEARCH': 'keyboardOverlayF1',
+    'forward<>SEARCH': 'keyboardOverlayF2',
+    'reload<>SEARCH': 'keyboardOverlayF3',
+    'maximize<>SEARCH': 'keyboardOverlayF4',
+    'switch window<>SEARCH': 'keyboardOverlayF5',
+    'bright down<>SEARCH': 'keyboardOverlayF6',
+    'bright up<>SEARCH': 'keyboardOverlayF7',
+    'mute<>SEARCH': 'keyboardOverlayF8',
+    'vol. down<>SEARCH': 'keyboardOverlayF9',
+    'vol. up<>SEARCH': 'keyboardOverlayF10',
+    'backspace<>SEARCH': 'keyboardOverlayDelete',
+    'down<>SEARCH': 'keyboardOverlayPageDown',
+    'right<>SEARCH': 'keyboardOverlayEnd',
+    'up<>SEARCH': 'keyboardOverlayPageUp',
+    'left<>SEARCH': 'keyboardOverlayHome',
+    '.<>SEARCH': 'keyboardOverlayInsert'
   }
 };