lib/third_party/tracing/model/power_series.js
function(ts, val) {
      var sample = new PowerSample(this, ts, val);
      this.samples_.push(sample);
      return sample;
    }
function(ts, val) {
      var sample = new PowerSample(this, ts, val);
      this.samples_.push(sample);
      return sample;
    }
function ( ts , val ) { var sample = new PowerSample ( this , ts , val ) ; this . samples_ . push ( sample ) ; return sample ; }
Adds a power sample to the series and returns it.

Note: Samples must be added in chronological order.
Adds a power sample to the series and returns it .