Video Player: Call video element's load method on loading video file.

ui/file_manager/video_player/js/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.
 
 /**
  * @fileoverview MediaControls class implements media playback controls
  * that exist outside of the audio/video HTML element.
  */
 
 /**
@@ skipping 601 matching lines @@
   this.textBanner_.removeAttribute('visible');
 
   // Reflect the media state in the UI.
   this.onMediaDuration_();
   this.onMediaPlay_(this.isPlaying());
   this.onMediaProgress_();
   if (this.volume_) {
     /* Copy the user selected volume to the new media element. */
     this.savedVolume_ = this.media_.volume = this.volume_.ratio;
   }
-  if (this.media_.textTracks.length > 0) {
+  if (this.media_.textTracks && this.media_.textTracks.length > 0) {

[yawano, 2016/03/29 08:29:23]

Very small optional nit: I don't think we need to check this here. As far as I
check the W3C specification, textTracks won't be null. -
https://www.w3.org/TR/2011/WD-html5-20110405/video.html#media-elements

[fukino, 2016/03/29 08:48:28]

If the media is CastVideoElement, the textTracks is undefined.
Maybe we should add textTracks property to CastVideoElement?

[yawano, 2016/03/29 08:59:14]

I get it. Thank you!

No, I don't think we need to add the property. It might make the element
consistent with the native VideoElement, but I think this check is okay for now.

     this.attachTextTrack_(this.media_.textTracks[0]);
   } else {
     this.attachTextTrack_(null);
   }
 };
 
 /**
  * Detach media event handlers.
  */
 MediaControls.prototype.detachMedia = function() {
@@ skipping 408 matching lines @@
   } else {
     this.container_.removeAttribute('fullscreen');
   }
 
   if (this.fullscreenButton_) {
     this.fullscreenButton_.setAttribute('aria-label',
         fullscreen ? str('VIDEO_PLAYER_EXIT_FULL_SCREEN_BUTTON_LABEL')
                    : str('VIDEO_PLAYER_FULL_SCREEN_BUTTON_LABEL'));;
   }
 };