Push cue timeline management out of LoadableTextTrack

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 192 matching lines @@
 
     if (cueTimeline())
         cueTimeline()->removeCues(this, m_cues.get());
 
     for (size_t i = 0; i < m_cues->length(); ++i)
         m_cues->item(i)->setTrack(0);
 
     m_cues = nullptr;
 }
 
+void TextTrack::addListOfCues(WillBeHeapVector<RefPtrWillBeMember<TextTrackCue>>& listOfNewCues)
+{
+    TextTrackCueList* cues = ensureTextTrackCueList();
+
+    for (auto& newCue : listOfNewCues) {
+        newCue->setTrack(this);
+        cues->add(newCue.release());
+    }
+
+    if (cueTimeline() && mode() != disabledKeyword())
+        cueTimeline()->addCues(this, cues);
+}
+
 TextTrackCueList* TextTrack::activeCues() const
 {
     // 4.8.10.12.5 If the text track mode ... is not the text track disabled mode,
     // then the activeCues attribute must return a live TextTrackCueList object ...
     // ... whose active flag was set when the script started, in text track cue
     // order. Otherwise, it must return null. When an object is returned, the
     // same object must be returned each time.
     // http://www.whatwg.org/specs/web-apps/current-work/#dom-texttrack-activecues
     if (m_cues && m_mode != disabledKeyword())
         return m_cues->activeCues();
@@ skipping 226 matching lines @@
 DEFINE_TRACE(TextTrack)
 {
     visitor->trace(m_cues);
     visitor->trace(m_regions);
     visitor->trace(m_trackList);
     TrackBase::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink