Eliminate TextTrackCue::updateDisplayTree()

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 188 matching lines @@
     // flag set, none of the cues in other cues have their text track cue active
     // flag set, and missed cues is empty, then abort these steps.
     bool activeSetChanged = missedCuesSize;
 
     for (size_t i = 0; !activeSetChanged && i < previousCuesSize; ++i) {
         if (!currentCues.contains(previousCues[i]) && previousCues[i].data()->isActive())
             activeSetChanged = true;
     }
 
     for (CueInterval currentCue : currentCues) {
-        currentCue.data()->updateDisplayTree(movieTime);
-
-        if (!currentCue.data()->isActive())
+        // Notify any cues that are already active of the current time to mark
+        // past and future nodes. Any inactive cues have an empty display state;
+        // they will be notified of the current time when the display state is
+        // updated.
+        if (currentCue.data()->isActive())
+            currentCue.data()->updatePastAndFutureNodes(movieTime);
+        else
             activeSetChanged = true;
     }
 
     if (!activeSetChanged)
         return;
 
     // 7 - If the time was reached through the usual monotonic increase of the
     // current playback position during normal playback, and there are cues in
     // other cues that have their text track cue pause-on-exi flag set and that
     // either have their text track cue active flag set or are also in missed
@@ skipping 125 matching lines @@
     if (!m_ignoreUpdate && mediaElement().inActiveDocument())
         updateActiveCues(mediaElement().currentTime());
 }
 
 DEFINE_TRACE(CueTimeline)
 {
     visitor->trace(m_mediaElement);
 }
 
 } // namespace blink