AdGroup adGroup = new AdGroup();
adGroup.setId(adGroupId);
// Create experiment bid multiplier rule that will modify ad group bid for
// the experiment.
ManualCPCAdGroupExperimentBidMultipliers adGroupExperimentBidMultipliers =
new ManualCPCAdGroupExperimentBidMultipliers();
adGroupExperimentBidMultipliers.setMaxCpcMultiplier(new BidMultiplier(1.5, null));
// Set experiment data to the ad group.
AdGroupExperimentData adGroupExperimentData = new AdGroupExperimentData();
adGroupExperimentData.setExperimentId(experimentId);
adGroupExperimentData.setExperimentDeltaStatus(ExperimentDeltaStatus.MODIFIED);