Hoist checks for 'disabled' tracks out of textTrackAddCue{,s}

Source/core/html/track/TextTrack.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 229 matching lines @@
     // 1. If the given cue is in a text track list of cues, then remove cue from that text track
     // list of cues.
     TextTrack* cueTrack = cue->track();
     if (cueTrack && cueTrack != this)
         cueTrack->removeCue(cue.get(), ASSERT_NO_EXCEPTION);
 
     // 2. Add cue to the method's TextTrack object's text track's text track list of cues.
     cue->setTrack(this);
     ensureTextTrackCueList()->add(cue);
 
-    if (mediaElement())
+    if (mediaElement() && m_mode != disabledKeyword())
         mediaElement()->textTrackAddCue(this, cue.get());
 }
 
 void TextTrack::removeCue(TextTrackCue* cue, ExceptionState& exceptionState)
 {
     if (!cue)
         return;
 
     // 4.8.10.12.5 Text track API
 
@@ skipping 99 matching lines @@
 }
 
 void TextTrack::cueDidChange(TextTrackCue* cue)
 {
     if (!mediaElement())
         return;
 
     // Make sure the TextTrackCueList order is up-to-date.
     ensureTextTrackCueList()->updateCueIndex(cue);
 
-    // ... and add it back again.
+    // ... and add it back again if the track is enabled.
+    if (m_mode == disabledKeyword())
+        return;
+
     mediaElement()->textTrackAddCue(this, cue);
 }
 
 int TextTrack::trackIndex()
 {
     ASSERT(m_trackList);
 
     if (m_trackIndex == invalidTrackIndex)
         m_trackIndex = m_trackList->getTrackIndex(this);
 
@@ skipping 59 matching lines @@
 void TextTrack::trace(Visitor* visitor)
 {
     visitor->trace(m_cues);
     visitor->trace(m_regions);
     visitor->trace(m_trackList);
     TrackBase::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink