code/Debug/Model/Design.php
public function getLayoutUpdates()
    {
        if ($this->uncompressedLayoutUpdates === null) {
            $this->uncompressedLayoutUpdates = $this->layoutUpdates ?
                json_decode(gzuncompress($this->layoutUpdates), true) : array();
        }

        return $this->uncompressedLayoutUpdates;
    }
public function getLayoutUpdates()
    {
        if ($this->uncompressedLayoutUpdates === null) {
            $this->uncompressedLayoutUpdates = $this->layoutUpdates ?
                json_decode(gzuncompress($this->layoutUpdates), true) : array();
        }

        return $this->uncompressedLayoutUpdates;
    }
Returns layout updates processed during the request

@return array