Hide call to removeDisplayTree in CueTimeline

Source/core/html/track/CueTimeline.cpp

 // Copyright 2015 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.
 
 #include "config.h"
 #include "core/html/track/CueTimeline.h"
 
 #include "core/events/Event.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLTrackElement.h"
@@ skipping 65 matching lines @@
         ASSERT(cue->isActive());
         m_currentlyActiveCues.remove(index);
         cue->setIsActive(false);
         // Since the cue will be removed from the media element and likely the
         // TextTrack might also be destructed, notifying the region of the cue
         // removal shouldn't be done.
         cue->removeDisplayTree(TextTrackCue::DontNotifyRegion);
     }
 }
 
+void CueTimeline::hideCues(TextTrack*, const TextTrackCueList* cues)
+{
+    for (size_t i = 0; i < cues->length(); ++i)
+        cues->item(i)->removeDisplayTree();
+}
+
 static bool trackIndexCompare(TextTrack* a, TextTrack* b)
 {
     return a->trackIndex() - b->trackIndex() < 0;
 }
 
 static bool eventTimeCueCompare(const std::pair<double, TextTrackCue*>& a, const std::pair<double, TextTrackCue*>& b)
 {
     // 12 - Sort the tasks in events in ascending time order (tasks with earlier
     // times first).
     if (a.first != b.first)
@@ skipping 245 matching lines @@
     if (!m_ignoreUpdate && mediaElement().inActiveDocument())
         updateActiveCues(mediaElement().currentTime());
 }
 
 DEFINE_TRACE(CueTimeline)
 {
     visitor->trace(m_mediaElement);
 }
 
 } // namespace blink