Play automatically when reloading the audio player with new songs.

chrome/browser/resources/file_manager/foreground/js/media/media_controls.js

 // Copyright (c) 2012 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';
 
 /**
  * @fileoverview MediaControls class implements media playback controls
  * that exist outside of the audio/video HTML element.
  */
@@ skipping 472 matching lines @@
  */
 MediaControls.prototype.restorePlayState = function() {};
 
 /**
  * Encode current state into the page URL or the app state.
  */
 MediaControls.prototype.encodeState = function() {
   if (!this.media_.duration)
     return;
 
-  if (window.appState) {
-    window.appState.time = this.media_.currentTime;
-    util.saveAppState();
-    return;
-  }
-
-  var playState = JSON.stringify({
-      play: this.isPlaying(),
-      time: this.media_.currentTime
-    });
-
-  var newLocation = document.location.origin + document.location.pathname +
-      document.location.search + '#' + playState;
-
-  document.location.href = newLocation;
+  window.appState.time = this.media_.currentTime;
+  util.saveAppState();
+  return;
 };
 
 /**
  * Decode current state from the page URL or the app state.
  * @return {boolean} True if decode succeeded.
  */
 MediaControls.prototype.decodeState = function() {
-  if (window.appState) {
-    if (!('time' in window.appState))
-      return false;
-    // There is no page reload for apps v2, only app restart.
-    // Always restart in paused state.
-    this.media_.currentTime = appState.time;
-    this.pause();
-    return true;
-  }
-
-  var hash = document.location.hash.substring(1);
-  if (hash) {
-    try {
-      var playState = JSON.parse(hash);
-      if (!('time' in playState))
-        return false;
-
-      this.media_.currentTime = playState.time;
-
-      if (playState.play)
-        this.play();
-      else
-        this.pause();
-
-      return true;
-    } catch (e) {
-      console.warn('Cannot decode play state');
-    }
-  }
-  return false;
+  if (!('time' in window.appState))
+    return false;
+  // There is no page reload for apps v2, only app restart.
+  // Always restart in paused state.
+  this.media_.currentTime = appState.time;
+  this.pause();
+  return true;
 };
 
 /**
  * Remove current state from the page URL or the app state.
  */
 MediaControls.prototype.clearState = function() {
-  if (window.appState) {
-    if ('time' in window.appState)
-      delete window.appState.time;
-    util.saveAppState();
-    return;
-  }
-
-  var newLocation = document.location.origin + document.location.pathname +
-      document.location.search + '#';
-
-  document.location.href = newLocation;
+  if ('time' in window.appState)
+    delete window.appState.time;
+  util.saveAppState();
+  return;
 };
 
 /**
  * Create a customized slider control.
  *
  * @param {HTMLElement} container The containing div element.
  * @param {number} value Initial value [0..1].
  * @param {number} range Number of distinct slider positions to be supported.
  * @param {function(number)} onChange Value change handler.
  * @param {function(boolean)} onDrag Drag begin/end handler.
@@ skipping 664 matching lines @@
 AudioControls.prototype.onAdvanceClick_ = function(forward) {
   if (!forward &&
       (this.getMedia().currentTime > AudioControls.TRACK_RESTART_THRESHOLD)) {
     // We are far enough from the beginning of the current track.
     // Restart it instead of than skipping to the previous one.
     this.getMedia().currentTime = 0;
   } else {
     this.advanceTrack_(forward);
   }
 };