[AudioPlayer] Implement shuffle mode

chrome/browser/resources/file_manager/audio_player/elements/control_panel.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.
 
 (function() {
   'use strict';
 
   /**
    * Moves |target| element above |anchor| element, in order to match the
    * bottom lines.
@@ skipping 75 matching lines @@
      * @type {boolean}
      */
     playlistExpanded: false,
 
     /**
      * Flag whether the volume slider is expanded or not.
      * @type {boolean}
      */
     volumeSliderShown: false,
 
-    /**
-     * Flag to enable shuffle mode.
+    /*

[hirono, 2014/02/04 11:21:06]

nit: /** ?
Same for the followings.

[yoshiki, 2014/02/04 11:39:21]

Done.

+     * Flag whether the shuffle mode is enabled.
      * @type {boolean}
      */
     shuffle: false,
 
     /*
-     * Flag to enable repeat mode.
+     * Flag whether the repeat mode is enabled.
      * @type {boolean}
      */
     repeat: false,
 
     /*
-     * Flag if the audio is playing or paused. True if playing, or false paused.
+     * Flag whether the audio is playing or paused. True if playing, or false
+     * paused.
      * @type {boolean}
      */
     playing: false,
 
     /**
      * Invoked when the 'playlistExpanded' property is changed.
      * @param {boolean} oldValue old value.
      * @param {boolean} newValue new value.
      */
     playlistExpandedChanged: function(oldValue, newValue) {
@@ skipping 48 matching lines @@
     /**
      * Invoked the value of the volume slider is changed.
      * @type {number}
      */
     volumeSliderChanged: function() {
       this.volume = this.$.volumeSlider.value;
       this.fire('volume-changed');
     },
   });
 })();  // Anonymous closure