VTTTextRunIterator  521 Source/core/html/track/vtt/VTTCue.cpp     BidiResolver<VTTTextRunIterator, BidiCharacterRun> bidiResolver;
VTTTextRunIterator  523 Source/core/html/track/vtt/VTTCue.cpp     bidiResolver.setPositionIgnoringNestedIsolates(VTTTextRunIterator(&run, 0));