adGroupBidModifier.setAdGroupId(adGroupId);
adGroupBidModifier.setBidModifier(BID_MODIFIER);
adGroupBidModifier.setCriterion(mobile);
// Create ADD operation.
AdGroupBidModifierOperation operation = new AdGroupBidModifierOperation();
operation.setOperand(adGroupBidModifier);
// Use 'ADD' to add a new modifier and 'SET' to update an existing one. A
// modifier can be removed with the 'REMOVE' operator.
operation.setOperator(Operator.ADD);
// Update ad group bid modifier.
AdGroupBidModifierReturnValue result =
adGroupBidModifierService.mutate(new AdGroupBidModifierOperation[] {operation});
for (AdGroupBidModifier bidModifierResult : result.getValue()) {