Merge "Fixed AutofillServiceHelper.assertValid() so it throws the right exception." into pi-dev

    static AutofillId[] assertValid(@Nullable AutofillId[] ids) {

        Preconditions.checkArgument(ids != null && ids.length > 0, "must have at least one id");

        return Preconditions.checkArrayElementsNotNull(ids, "ids");

        // Can't use Preconditions.checkArrayElementsNotNull() because it throws NPE instead of IAE

        for (int i = 0; i < ids.length; ++i) {

            if (ids[i] == null) {

                throw new IllegalArgumentException("ids[" + i + "] must not be null");

            }

        }

        return ids;

    }

    private AutofillServiceHelper() {