Wire up an api to darken screen for accessibility

chrome/browser/resources/chromeos/chromevox/common/key_sequence.js

 // Copyright 2014 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.
 
 /**
  * @fileoverview A JavaScript class that represents a sequence of keys entered
  * by the user.
  */
 
 
@@ skipping 51 matching lines @@
   } else {
     this.cvoxModifier = opt_cvoxModifier;
   }
   this.stickyMode = !!originalEvent['stickyMode'];
   this.prefixKey = !!originalEvent['keyPrefix'];
 
   if (this.stickyMode && this.prefixKey) {
     throw 'Prefix key and sticky mode cannot both be enabled: ' + originalEvent;
   }
 
-  var event = this.resolveChromeOSSpecialKeys_(originalEvent);
+  var event = originalEvent;
 
   // TODO (rshearer): We should take the user out of sticky mode if they
   // try to use the CVox modifier or prefix key.
 
   /**
    * Stores the key codes and modifiers for the keys in the key sequence.
    * TODO(rshearer): Consider making this structure an array of minimal
    * keyEvent-like objects instead so we don't have to worry about what happens
    * when ctrlKey.length is different from altKey.length.
    *
@@ skipping 557 matching lines @@
       break;
     case 122:  // F11
       evt['keyCode'] = 189;  // Hyphen.
       break;
     case 123:  // F12
       evt['keyCode'] = 187;  // Equals.
       break;
   }
   return evt;
 };