adGroupCriterion.setCriterion(new Criterion(criterionId, null, null));
adGroupCriterion.setAdGroupId(adGroupId);
// Create experiment bid multiplier rule that will modify ad group bid for
// the experiment.
ManualCPCAdGroupCriterionExperimentBidMultiplier adGroupCriterionExperimentBidMultiplier =
new ManualCPCAdGroupCriterionExperimentBidMultiplier();
adGroupCriterionExperimentBidMultiplier.setMaxCpcMultiplier(new BidMultiplier(1.5, null));
// Set experiment data to the ad group.
BiddableAdGroupCriterionExperimentData adGroupCriterionExperimentData =
new BiddableAdGroupCriterionExperimentData();
adGroupCriterionExperimentData.setExperimentId(experimentId);