BeginWrite        109 net/quic/quic_data_writer.cc   char *dest = BeginWrite(data.TotalBufferSize());
BeginWrite        137 net/quic/quic_data_writer.cc   char* dest = BeginWrite(data_len);
BeginWrite        149 net/quic/quic_data_writer.cc   char* dest = BeginWrite(count);
BeginWrite         72 net/quic/quic_data_writer.h   char* BeginWrite(size_t length);