async function distinguishLHR(lhr, tabId) {
  if (tabId === 'desktop') {
    lhr.categories.performance.score = 0.81;
  }

  const finalSSDetails = lhr.audits['final-screenshot']?.details;
  if (finalSSDetails && finalSSDetails.type === 'screenshot') {
    finalSSDetails.data = await decorateScreenshot(finalSSDetails.data, tabId);
  }

  if (lhr.fullPageScreenshot) {
    lhr.fullPageScreenshot.screenshot.data =
      await decorateScreenshot(lhr.fullPageScreenshot.screenshot.data, tabId);
  }
}
Tweak the LHR to make the desktop and mobile reports easier to identify.
Adjusted: Perf category name and score, and emoji placed on top of key screenshots.
@param {LH.Result} lhr
@param {string} tabId