Function iframeNestingDepth

ads/google/a4a/utils.js:397–406

* @param {!Window} win * @return {number}

(win)

 * @return {number}
 */
function iframeNestingDepth(win) {
  let w = win;
  let depth = 0;
  while (w != w.parent && depth < 100) {
    w = w.parent;
    depth++;
  }
  devAssert(w == win.top);
  return depth;
}

/**
 * @param {!Window} win