ServiceWorker.dispatchSyncEvent

{
  "name": "dispatchSyncEvent",
  "parameters": [
    {
      "name": "origin",
      "type": "string"
    },
    {
      "name": "registrationId",
      "type": "string"
    },
    {
      "name": "tag",
      "type": "string"
    },
    {
      "name": "lastChance",
      "type": "boolean"
    }
  ],
  "handlers": [
    "browser"
  ]
}