CacheKey.php

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<?php
namespace Magento\Framework\View\Model\Layout;

class CacheKey implements \Magento\Framework\View\Layout\LayoutCacheKeyInterface
{
    private $cacheKeys = [];

    public function addCacheKeys($cacheKeys)
    {
        if (!is_array($cacheKeys)) {
            $cacheKeys = [$cacheKeys];
        }
        $this->cacheKeys = array_merge($this->cacheKeys, $cacheKeys);
    }

    public function getCacheKeys()
    {
        return $this->cacheKeys;
    }
}