Method sendMessage

src/service/viewer-impl.js:768–770

@override

(eventType, data, cancelUnsent = false)

  /** @override */
  sendMessage(eventType, data, cancelUnsent = false) {
    this.sendMessageInternal_(eventType, data, cancelUnsent, false);
  }

  /** @override */
  sendMessageAwaitResponse(eventType, data, cancelUnsent = false) {