dom/indexedDB/test/service_worker.js


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onmessage = function(e) {
  self.clients.matchAll().then(function(res) {
    if (!res.length) {
      dump("Error: no clients are currently controlled.\n");
      return;
    }
    res[0].postMessage(indexedDB ? { available: true } :
                                   { available: false });
  });
};