44714   struct ChunkRecord {  struct in perfetto::TraceBuffer
44715     explicit ChunkRecord(size_t sz) : flags{0}, is_padding{0} {  in ChunkRecord()  function
44721     bool is_valid() const { return size != 0; }  in is_valid()
44726     ChunkID chunk_id = 0;
44729     ProducerID producer_id = 0;
44733     WriterID writer_id = 0;
44736     uint16_t num_fragments = 0;
44739     uint16_t size;
44741     uint8_t flags : 6;  // See SharedMemoryABI::ChunkHeader::flags.
44742     uint8_t is_padding : 1;
44743     uint8_t unused_flag : 1;
44747     char unused[3] = {'C', 'H', 'U'};
44749     static constexpr size_t kMaxSize =