FileSystemBaseHandle-postMessage-BroadcastChannel.https.window.js

// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
// META: script=resources/test-helpers.js
// META: script=resources/sandboxed-fs-test-helpers.js
// META: script=resources/messaging-helpers.js
// META: script=resources/messaging-serialize-helpers.js
// META: script=script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js
// META: timeout=long