code: func (c *HeapProfiler) StartSampling(samplingInterval float64) (*gcdmessage.ChromeResponse, error) {
  	var v HeapProfilerStartSamplingParams
  	v.SamplingInterval = samplingInterval
  	return c.StartSamplingWithParams(&v)
  }
docs: // StartSampling -
  // samplingInterval - Average sample interval in bytes. Poisson distribution is used for the intervals. The default value is 32768 bytes.