Customlayoutupdate.php

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<?php
namespace Magento\Catalog\Model\Attribute\Backend;

use Magento\Framework\View\Model\Layout\Update\ValidatorFactory;
use Magento\Eav\Model\Entity\Attribute\Exception;

class Customlayoutupdate extends \Magento\Eav\Model\Entity\Attribute\Backend\AbstractBackend
{
    protected $_layoutUpdateValidatorFactory;

    public function __construct(ValidatorFactory $layoutUpdateValidatorFactory)
    {
        $this->_layoutUpdateValidatorFactory = $layoutUpdateValidatorFactory;
    }

    public function validate($object)
    {
        $attributeName = $this->getAttribute()->getName();
        $xml = trim($object->getData($attributeName));

        if (!$this->getAttribute()->getIsRequired() && empty($xml)) {
            return true;
        }

        $validator = $this->_layoutUpdateValidatorFactory->create();
        if (!$validator->isValid($xml)) {
            $messages = $validator->getMessages();
            //Add first message to exception
            $message = array_shift($messages);
            $eavExc = new Exception(__($message));
            $eavExc->setAttributeCode($attributeName);
            throw $eavExc;
        }
        return true;
    }
}