Tests that browser.Target.setAutoAttach() attaches to new about:blank page.
Created new page from another session
Auto-attached to the new page: {
    method : Target.attachedToTarget
    params : {
        sessionId : <string>
        targetInfo : {
            attached : true
            browserContextId : <string>
            canAccessOpener : false
            targetId : <string>
            title :
            type : page
            url :
        }
        waitingForDebugger : true
    }
}
Resumed
Received new target info: {
    method : Target.targetInfoChanged
    params : {
        targetInfo : {
            attached : true
            browserContextId : <string>
            canAccessOpener : false
            targetId : <string>
            title : about:blank#newpage
            type : page
            url : about:blank#newpage
        }
    }
}