Fix HTMLMediaElement so that it doesn't add cues for disabled text tracks.

Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1252 matching lines @@
 }
 
 void HTMLMediaElement::endIgnoringTrackDisplayUpdateRequests()
 {
     ASSERT(m_ignoreTrackDisplayUpdate);
     --m_ignoreTrackDisplayUpdate;
     if (!m_ignoreTrackDisplayUpdate && m_inActiveDocument)
         updateActiveTextTrackCues(currentTime());
 }
 
-void HTMLMediaElement::textTrackAddCues(TextTrack*, const TextTrackCueList* cues)
+void HTMLMediaElement::textTrackAddCues(TextTrack* track, const TextTrackCueList* cues)
 {
     LOG(Media, "HTMLMediaElement::textTrackAddCues");
+    if (track->mode() == TextTrack::disabledKeyword())
+        return;
 
     TrackDisplayUpdateScope scope(this);
     for (size_t i = 0; i < cues->length(); ++i)
         textTrackAddCue(cues->item(i)->track(), cues->item(i));
 }
 
 void HTMLMediaElement::textTrackRemoveCues(TextTrack*, const TextTrackCueList* cues)
 {
     LOG(Media, "HTMLMediaElement::textTrackRemoveCues");
 
     TrackDisplayUpdateScope scope(this);
     for (size_t i = 0; i < cues->length(); ++i)
         textTrackRemoveCue(cues->item(i)->track(), cues->item(i));
 }
 
-void HTMLMediaElement::textTrackAddCue(TextTrack*, PassRefPtr<TextTrackCue> cue)
+void HTMLMediaElement::textTrackAddCue(TextTrack* track, PassRefPtr<TextTrackCue> cue)
 {
+    if (track->mode() == TextTrack::disabledKeyword())
+        return;
+
     // Negative duration cues need be treated in the interval tree as
     // zero-length cues.
     double endTime = max(cue->startTime(), cue->endTime());
 
     CueInterval interval = m_cueTree.createInterval(cue->startTime(), endTime, cue.get());
     if (!m_cueTree.contains(interval))
         m_cueTree.add(interval);
     updateActiveTextTrackCues(currentTime());
 }
 
@@ skipping 2670 matching lines @@
     info.addMember(m_mediaGroup, "mediaGroup");
     info.addMember(m_mediaController, "mediaController");
 
 #if ENABLE(WEB_AUDIO)
     info.addMember(m_audioSourceNode, "audioSourceNode");
 #endif
 
 }
 
 }