[AudioPleyer] Fix repeat even when there is a single file in the list.

chrome/browser/resources/file_manager/audio_player/elements/audio_player.js

Index: chrome/browser/resources/file_manager/audio_player/elements/audio_player.js
diff --git a/chrome/browser/resources/file_manager/audio_player/elements/audio_player.js b/chrome/browser/resources/file_manager/audio_player/elements/audio_player.js
index 0694030f7abb54c6ccc6766acc1eaa12e298a68d..12449cbfc2c9f07558ee4420f14ed1cc4650de89 100644
--- a/chrome/browser/resources/file_manager/audio_player/elements/audio_player.js
+++ b/chrome/browser/resources/file_manager/audio_player/elements/audio_player.js
@@ -205,6 +205,15 @@ Polymer('audio-player', {
         (this.trackList.getNextTrackIndex(forward, repeat) !== -1);
 
     this.audioController.playing = isNextTrackAvailable;
+
+    // If there is only a single file in the list, 'currentTrackInde' is not
+    // changed and the handler is not invoked. Instead, plays here.
+    // TODO(yoshiki): clean up the code around here.
+    if (isNextTrackAvailable &&
+        this.trackList.currentTrackIndex == nextTrackIndex) {
+      this.audioElement.play();
+    }
+
     this.trackList.currentTrackIndex = nextTrackIndex;
 
     Platform.performMicrotaskCheckpoint();