[AudioPlayer] Implement shuffle mode

chrome/browser/resources/file_manager/audio_player/elements/audio_player.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.
 
 'use strict';
 
 Polymer('audio-player', {
   /**
    * Child Elements
    */
@@ skipping 112 matching lines @@
     if (this.audioElement.readyState !== 0)
       this.audioElement.currentTime = this.audioController.time / 1000;
   },
 
   /**
    * Invoked when audioController.shuffle is changed.
    * @param {boolean} oldValue old value.
    * @param {boolean} newValue new value.
    */
   onControllerShuffleChanged: function(oldValue, newValue) {
-    // TODO(yoshiki): Implement shuffle mode.
+    this.trackList.shuffle = newValue;
   },
 
   /**
    * Invoked when audioController.repeat is changed.
    * @param {boolean} oldValue old value.
    * @param {boolean} newValue new value.
    */
   onControllerRepeatChanged: function(oldValue, newValue) {
     this.trackList.repeat = newValue;
   },
@@ skipping 156 matching lines @@
     this.audioController.playlistExpanded = !!expand;
   },
 
   /**
    * Invoked when the audio player is being unloaded.
    */
   onPageUnload: function() {
     this.audioElement.src = '';  // Hack to prevent crashing.
   },
 });