Tests the Timeline API instrumentation of a Layout event

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Layout Properties:
{
    children : <object>
    counters : <object>
    data : {
        dirtyObjects : 3
        partialLayout : true
        root : <object>
        totalObjects : 8
    }
    endTime : <number>
    frameId : <string>
    stackTrace : <object>
    startTime : <number>
    type : "Layout"
    usedHeapSize : <number>
}
Layout Properties:
{
    children : <object>
    counters : <object>
    data : {
        dirtyObjects : 2
        partialLayout : true
        root : <object>
        totalObjects : 11
    }
    endTime : <number>
    frameId : <string>
    stackTrace : <object>
    startTime : <number>
    type : "Layout"
    usedHeapSize : <number>
}