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

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index ed65abe872e271a83a47b550a83a90038999fd7f..889798867248f286a0f763d6a1e0e10e02e8c056 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -1270,9 +1270,11 @@ void HTMLMediaElement::endIgnoringTrackDisplayUpdateRequests()
         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)
@@ -1288,8 +1290,11 @@ void HTMLMediaElement::textTrackRemoveCues(TextTrack*, const TextTrackCueList* c
         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());