content/test/data/compute_pressure/observer-in-shared-worker.js

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

onconnect = function(e) {
  const port = e.ports[0];

  function pressureChange(data) {
    port.postMessage({type: 'data', update: data[0].toJSON()});
  }

  const observer = new PressureObserver(pressureChange);

  port.onmessage = async (e) => {
    if (e.data.command == 'start') {
      try {
        await observer.observe('cpu');
        port.postMessage({result: 'success'});
      } catch (error) {
        port.postMessage({result: 'fail'});
      }
    }
  }

  port.start();
}