DOMOverlays perf

DOMOverlays rev2 perf

{
const {DOMLocalization} = ChromeUtils.import("resource://gre/modules/DOMLocalization.jsm");
let count = 10000;
let l10n = {
  value: `Click on <img data-l10n-name="picture"/> to go to <a data-l10n-name="link"/>the website</a>.`
};
let elems = [];
for(let i = 0; i < count; i++) {
  let elem = document.createElement("description");
  let frag = MozXULElement.parseXULToFragment(`<img src="logo.png" data-l10n-name="picture"/><a href="www.mozilla.org" data-l10n-name="link"></a>`);
  elem.appendChild(frag);
  elems.push(elem);
}
let start = performance.now();
for(let i = 0; i < count; i++) {
  //DOMLocalization.justTranslateElement(elems[i], l10n);
  DOMOverlays.translateElement(elems[i], l10n);
}
let end = performance.now();
console.log(`time: ${end - start}`);
}