Method installExtensionsInEmbed

src/friendly-iframe-embed.js:717–808

* Install extensions in the child window (friendly iframe). The pre-install * callback, if specified, is executed after polyfills have been configured * but before the first extension is installed. * @param {!FriendlyIframeEmbed} embed * @param {!./service/extensions-impl.Extensions} ext

(
    embed,
    extensionsService,
    ampdoc,
    extensions,
    preinstallCallback,
    opt_installComplete
  )

   * @return {!Promise}
   */
  static installExtensionsInEmbed(
    embed,
    extensionsService,
    ampdoc,
    extensions,
    preinstallCallback,
    opt_installComplete
  ) {
    const childWin = ampdoc.win;
    const parentWin = getWin(childWin.frameElement);
    setParentWindow(childWin, parentWin);
    const getDelayPromise = getDelayPromiseProducer();

    return getDelayPromise(undefined)
      .then(() => {
        // Install necessary polyfills.
        installPolyfillsInChildWindow(parentWin, childWin);
      })
      .then(getDelayPromise)
      .then(() => {
        if (mode.isEsm()) {
          // TODO: This is combined (ampdoc + shared), not just shared
          // const css = parentWin.document.querySelector('style[amp-runtime]')
          // .textContent;
          installStylesForDoc(
            ampdoc,
            ampSharedCss,
            /* callback */ null,
            /* opt_isRuntimeCss */ true,
            /* opt_ext */ 'amp-runtime'
          );
        } else {
          // Install runtime styles.
          installStylesForDoc(
            ampdoc,
            ampSharedCss,
            /* callback */ null,
            /* opt_isRuntimeCss */ true,
            /* opt_ext */ 'amp-runtime'
          );
        }
      })
      .then(getDelayPromise)
      .then(() => {
        if (!childWin.frameElement) {
          return;
        }
        // Run pre-install callback.
        if (preinstallCallback) {
          preinstallCallback(ampdoc.win, ampdoc);
        }
      })
      .then(getDelayPromise)
      .then(() => {
        if (!childWin.frameElement) {
          return;
        }
        // Install embeddable standard services.