Builder.php

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<?php
namespace Magento\Framework\View\Page;

use Magento\Framework\App;
use Magento\Framework\Event;
use Magento\Framework\View;

class Builder extends View\Layout\Builder
{
    protected $pageConfig;

    protected $pageLayoutReader;

    public function __construct(
        View\LayoutInterface $layout,
        App\Request\Http $request,
        Event\ManagerInterface $eventManager,
        Config $pageConfig,
        Layout\Reader $pageLayoutReader
    ) {
        parent::__construct($layout, $request, $eventManager);
        $this->pageConfig = $pageConfig;
        $this->pageLayoutReader = $pageLayoutReader;
        $this->pageConfig->setBuilder($this);
    }

    protected function generateLayoutBlocks()
    {
        $this->readPageLayout();
        return parent::generateLayoutBlocks();
    }

    protected function readPageLayout()
    {
        $pageLayout = $this->getPageLayout();
        if ($pageLayout) {
            $readerContext = $this->layout->getReaderContext();
            $this->pageLayoutReader->read($readerContext, $pageLayout);
        }
    }

    protected function getPageLayout()
    {
        return $this->pageConfig->getPageLayout() ?: $this->layout->getUpdate()->getPageLayout();
    }
}