Generate and assign media track ids in demuxers.

third_party/WebKit/Source/core/html/track/TextTrackList.cpp

 /*
  * Copyright (C) 2011, 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 116 matching lines @@
 }
 
 TextTrack* TextTrackList::getTrackById(const AtomicString& id)
 {
     // 4.8.10.12.5 Text track API
     // The getTrackById(id) method must return the first TextTrack in the
     // TextTrackList object whose id IDL attribute would return a value equal
     // to the value of the id argument.
     for (unsigned i = 0; i < length(); ++i) {
         TextTrack* track = anonymousIndexedGetter(i);
-        if (track->id() == id)
+        if (String(track->id()) == id)
             return track;
     }
 
     // When no tracks match the given argument, the method must return null.
     return 0;
 }
 
 void TextTrackList::invalidateTrackIndexesAfterTrack(TextTrack* track)
 {
     HeapVector<Member<TextTrack>>* tracks = nullptr;
@@ skipping 175 matching lines @@
 
 DEFINE_TRACE_WRAPPERS(TextTrackList)
 {
     for (auto track : m_addTrackTracks)
         visitor->traceWrappers(track);
     for (auto track : m_elementTracks)
         visitor->traceWrappers(track);
     for (auto track : m_inbandTracks)
         visitor->traceWrappers(track);
 }