Send 'key' from fake keyboard events generated by file_manager.

ui/file_manager/file_manager/background/js/test_util_base.js

 // Copyright (c) 2015 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.
 
 /**
  * Namespace for test related things.
  */
 var test = test || {};
 
 /**
@@ skipping 318 matching lines @@
   return test.util.sync.sendEvent(contentWindow, targetQuery, event);
 };
 
 /**
  * Sends a fake key event to the element specified by |targetQuery| or active
  * element with the given |keyIdentifier| and optional |ctrl| modifier.
  *
  * @param {Window} contentWindow Window to be tested.
  * @param {?string} targetQuery Query to specify the element. If this value is
  *     null, key event is dispatched to active element of the document.
+ * @param {string} key DOM UI Events key value.
  * @param {string} keyIdentifier Identifier of the emulated key.
  * @param {boolean} ctrl Whether CTRL should be pressed, or not.
  * @param {boolean} shift whether SHIFT should be pressed, or not.
  * @param {boolean} alt whether ALT should be pressed, or not.
  * @param {string=} opt_iframeQuery Optional iframe selector.
  * @return {boolean} True if the event is sent to the target, false otherwise.
  */
 test.util.sync.fakeKeyDown = function(
-    contentWindow, targetQuery, keyIdentifier, ctrl, shift, alt,
+    contentWindow, targetQuery, key, keyIdentifier, ctrl, shift, alt,
     opt_iframeQuery) {
   var event = new KeyboardEvent('keydown',
       {
         bubbles: true,
+        key: key,
         keyIdentifier: keyIdentifier,
         ctrlKey: ctrl,
         shiftKey: shift,
         altKey: alt
       });
   return test.util.sync.sendEvent(
       contentWindow, targetQuery, event, opt_iframeQuery);
 };
 
 /**
@@ skipping 219 matching lines @@
       return true;
     } else if (test.util.sync[request.func]) {
       sendResponse(test.util.sync[request.func].apply(null, args));
       return false;
     } else {
       console.error('Invalid function name.');
       return false;
     }
   });
 };