Add chrome.virtualKeyboardPrivate.setHotrodKeyboard api

chrome/test/data/chromeos/virtual_keyboard/virtual_keyboard_test_base.js

 /*
  * Copyright 2013 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.
  */
 
 /**
  * Set to true while debugging virtual keyboard tests, for verbose debug output.
  */
 var debugging = false;
@@ skipping 69 matching lines @@
 
   var virtualKeyboardPrivateMethods = [
     'getKeyboardConfig',
     'hideKeyboard',
     'insertText',
     'lockKeyboard',
     'moveCursor',
     'sendKeyEvent',
     'setMode',
     'setKeyboardState',
+    'setHotrodKeyboard'
   ];
 
   var inputMethodPrivateMethods = [
     'getCurrentInputMethod',
     'getInputMethods',
     'setCurrentInputMethod'
   ];
 
   addMocks('chrome.virtualKeyboardPrivate', virtualKeyboardPrivateMethods);
   addMocks('chrome.inputMethodPrivate', inputMethodPrivateMethods);
@@ skipping 331 matching lines @@
     assertTrue(!!switchKey, 'Unable to find symbol transition key');
     // Switch to symbol keyset.
     mockTap(switchKey);
   } else {
     var switchKey = findKey('~[<', 'row3');
     assertTrue(!!switchKey, 'Unable to find more transition key');
     // Switch to more keyset.
     mockTap(switchKey);
   }
 }