Method start

third_party/subscriptions-project/swg.js:7948–7979

* @return {!Promise<!../components/activities.ActivityIframePort>}

()

   * @return {!Promise<!../components/activities.ActivityIframePort>}
   */
  start() {
    if (!this.serviceReady_) {
      // Please note that currently openIframe reads the current analytics
      // context and that it may not contain experiments activated late during
      // the publishers code lifecycle.
      this.addLabels(getOnExperiments(this.doc_.getWin()));
      this.serviceReady_ = this.activityPorts_
        .openIframe(this.iframe_, feUrl('/serviceiframe'), null, true)
        .then(
          (port) => {
            // Register a listener for the logging to code indicate it is
            // finished logging.
            port.on(FinishedLoggingResponse, this.afterLogging_.bind(this));
            return port.whenReady().then(() => {
              // The publisher should be done setting experiments but runtime
              // will forward them here if they aren't.
              this.addLabels(getOnExperiments(this.doc_.getWin()));
              return port;
            });
          },
          (message) => {
            // If the port doesn't open register that logging is broken so
            // nothing is just waiting.
            this.loggingBroken_ = true;
            this.afterLogging_(
              createErrorResponse('Could not connect [' + message + ']')
            );
          }
        );
    }
    return this.serviceReady_;
  }

  /**
   * @param {boolean} isReadyToPay