Push cue timeline management out of LoadableTextTrack

Source/core/html/track/vtt/VTTParser.cpp

 /*
  * Copyright (C) 2011 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 72 matching lines @@
 VTTParser::VTTParser(VTTParserClient* client, Document& document)
     : m_document(&document)
     , m_state(Initial)
     , m_decoder(TextResourceDecoder::create("text/plain", UTF8Encoding()))
     , m_currentStartTime(0)
     , m_currentEndTime(0)
     , m_client(client)
 {
 }
 
-void VTTParser::getNewCues(WillBeHeapVector<RefPtrWillBeMember<VTTCue>>& outputCues)
+void VTTParser::getNewCues(WillBeHeapVector<RefPtrWillBeMember<TextTrackCue>>& outputCues)
 {
-    outputCues = m_cueList;
-    m_cueList.clear();
+    ASSERT(outputCues.isEmpty());
+    outputCues.swap(m_cueList);
 }
 
 void VTTParser::getNewRegions(WillBeHeapVector<RefPtrWillBeMember<VTTRegion>>& outputRegions)
 {
-    outputRegions = m_regionList;
-    m_regionList.clear();
+    ASSERT(outputRegions.isEmpty());
+    outputRegions.swap(m_regionList);
 }
 
 void VTTParser::parseBytes(const char* data, unsigned length)
 {
     String textData = m_decoder->decode(data, length);
     m_lineReader.append(textData);
     parse();
 }
 
 void VTTParser::flush()
@@ skipping 447 matching lines @@
 }
 
 DEFINE_TRACE(VTTParser)
 {
     visitor->trace(m_document);
     visitor->trace(m_cueList);
     visitor->trace(m_regionList);
 }
 
 }