Method installExtensionInDoc

src/service/extensions-impl.js:501–515

* Installs all ampdoc factories for the specified extension. * @param {!./ampdoc-impl.AmpDoc} ampdoc * @param {string} extensionId * @param {string=} version * @return {!Promise}

(ampdoc, extensionId, version = DEFAULT_VERSION)

   * @return {!Promise}
   */
  installExtensionInDoc(ampdoc, extensionId, version = DEFAULT_VERSION) {
    ampdoc.declareExtension(extensionId, version);
    return this.waitFor_(this.getExtensionHolder_(extensionId, version)).then(
      () => {
        const holder = this.getExtensionHolder_(extensionId, version);
        holder.docFactories.forEach((factory) => {
          try {
            factory(ampdoc);
          } catch (e) {
            rethrowAsync('Doc factory failed: ', e, extensionId);
          }
        });
      }
    );
  }

  /**
   * Creates or returns an existing extension holder.