How to use the @angular/benchpress.Validator function in @angular/benchpress

var benchpress = require('@angular/benchpress');
var runner = new benchpress.Runner([
  //use protractor as Webdriver client
  benchpress.SeleniumWebDriverAdapter.PROTRACTOR_PROVIDERS,
  //use RegressionSlopeValidator to validate samples
  {provide: benchpress.Validator, useExisting: benchpress.RegressionSlopeValidator},
  //use 10 samples to calculate slope regression
  {provide: benchpress.RegressionSlopeValidator.SAMPLE_SIZE, useValue: 20},
  //use the script metric to calculate slope regression
  {provide: benchpress.RegressionSlopeValidator.METRIC, useValue: 'scriptTime'},
  {provide: benchpress.Options.FORCE_GC, useValue: true}
]);

describe('deep tree baseline', function() {
  it('should be fast!', function(done) {
    var depth = 11;
    //Tells protractor this isn't an Angular 1 application
    browser.ignoreSynchronization = true;
    //Load the benchmark, with a tree depth of 9
    browser.get('http://localhost:8080/tree.html?depth='+depth);
    /*
     * Tell benchpress to click the buttons to destroy and re-create the tree for each sample.