Theme.php

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<?php
namespace Magento\Theme\Helper;

class Theme extends \Magento\Framework\App\Helper\AbstractHelper
{
    protected $_layoutProcessorFactory;

    protected $_assetRepo;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Framework\View\Layout\ProcessorFactory $layoutProcessorFactory,
        \Magento\Framework\View\Asset\Repository $assetRepo
    ) {
        $this->_layoutProcessorFactory = $layoutProcessorFactory;
        $this->_assetRepo = $assetRepo;
        parent::__construct($context);
    }

    public function getCssAssets($theme)
    {
        $layoutProcessor = $this->_layoutProcessorFactory->create(['theme' => $theme]);
        $layoutElement = $layoutProcessor->getFileLayoutUpdatesXml();

        $xpathSelectorBlocks = '//block[@class="Magento\Theme\Block\Html\Head"]' .
            '/block[@class="Magento\Theme\Block\Html\Head\Css"]/arguments/argument[@name="file"]';

        $xpathSelectorRefs = '//referenceBlock[@name="head"]' .
            '/block[@class="Magento\Theme\Block\Html\Head\Css"]/arguments/argument[@name="file"]';

        $elements = array_merge(
            $layoutElement->xpath($xpathSelectorBlocks) ?: [],
            $layoutElement->xpath($xpathSelectorRefs) ?: []
        );

        $params = [
            'area'       => $theme->getArea(),
            'themeModel' => $theme,
        ];

        $result = [];
        foreach ($elements as $fileId) {
            $fileId = (string)$fileId;
            $result[$fileId] = $this->_assetRepo->createAsset($fileId, $params);
        }
        ksort($result);
        return $result;
    }
}