void bufferSubData(int target, int offset, data)

Source 

void bufferSubData(int target, int offset, data) {
  if ((data is TypedData) && (offset is int) && (target is int)) {
    _blink.BlinkWebGLRenderingContext.instance.bufferSubData_Callback_3_(this, target, offset, data);
    return;
  }
  if ((data is ByteBuffer || data == null) && (offset is int) && (target is int)) {
    _blink.BlinkWebGLRenderingContext.instance.bufferSubData_Callback_3_(this, target, offset, data);
    return;
  }
  throw new ArgumentError("Incorrect number or type of arguments");
}