Tests auto-attach of shared workers.
{
    attached : true
    browserContextId : <string>
    canAccessOpener : false
    targetId : <string>
    title :
    type : shared_worker
    url : http://127.0.0.1:8000/inspector-protocol/fetch/resources/shared-worker.js
}
{
    attached : true
    browserContextId : <string>
    canAccessOpener : false
    targetId : <string>
    title :
    type : shared_worker
    url : http://127.0.0.1:8000/inspector-protocol/fetch/resources/shared-worker.js?worker2
}