Add tests for braille commands.

chrome/browser/resources/chromeos/chromevox/host/interface/braille_interface.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 Defines a Braille interface.
  *
  * All Braille engines in ChromeVox conform to this interface.
  *
  */
 
 goog.provide('cvox.BrailleInterface');
 
 goog.require('cvox.BrailleKeyCommand');
 goog.require('cvox.BrailleKeyEvent');
 goog.require('cvox.NavBraille');
 
 /**
  * @interface
  */
 cvox.BrailleInterface = function() { };
 
 /**
  * Sends the given params to the Braille display for output.
  * @param {!cvox.NavBraille} params Parameters to send to the
  * platform braille service.
  */
 cvox.BrailleInterface.prototype.write =
     function(params) { };
-
-/**
- * Sets a callback for handling braille keyboard commands.
- *
- * @param {function(!cvox.BrailleKeyEvent, cvox.NavBraille)} func The function
- * to be called when the user invokes a keyboard command on the braille
- * display. The first parameter is the key event.  The second parameter is
- * the content that was present on the display when the key command
- * was invoked, if available.
- */
-cvox.BrailleInterface.prototype.setCommandListener =
-    function(func) { };