Tests that browser.Target.createTarget() creates a tab target when forTab is set.
Attached to the tab target: {
    method : Target.attachedToTarget
    params : {
        sessionId : <string>
        targetInfo : {
            attached : true
            browserContextId : <string>
            canAccessOpener : false
            targetId : <string>
            title :
            type : tab
            url : http://127.0.0.1:8000/inspector-protocol/resources/test-page.html
        }
        waitingForDebugger : false
    }
}