Tests that screenshot works with clip
{"format":"png","clip":{"x":0,"y":15018,"width":54,"height":54,"scale":1}}
{
    id : <number>
    result : {
        data : iVBORw0KGgoAAAANSUhEUgAAADYAAAA2CAIAAAADJ/2KAAAAZklEQVR4nOzaMQqAQAwAwSg+/H6uCD5hixNmmrRL0uaauWdv52zv+uY6ZkPrvfAPtiixILEgsSCxILEgsSCxILEgsSCxILEgsSCxILEgsSCxILEgsSCxILEgsSCxILEgsXD4jQg8AAAA//8cDyTIAAAABklEQVQDANZuBG45cuJaAAAAAElFTkSuQmCC
    }
    sessionId : <string>
}
{"format":"png","clip":{"x":0,"y":15018,"width":54,"height":54,"scale":0.5}}
{
    id : <number>
    result : {
        data : iVBORw0KGgoAAAANSUhEUgAAABsAAAAbCAIAAAACtmMCAAAAMklEQVR4nOzWsREAMAjDQJNjcDYnxw4qpcLl1+5kg9Y3U6GafaFTVFRUVFRUpCv8U3wAAAD//x6OsGoAAAAGSURBVAMAM88EOIJhkMYAAAAASUVORK5CYII=
    }
    sessionId : <string>
}
{"format":"png","clip":{"x":0,"y":15018,"width":54,"height":54,"scale":2}}
{
    id : <number>
    result : {
        data : iVBORw0KGgoAAAANSUhEUgAAAGwAAABsCAIAAAAABMCaAAABEUlEQVR4nOzVMQqAQBAEwVV8uD8/QzETrsOqbNNmYK+ZNew5h20iBkQMXJ/rPoaf7veXWGJAxICIAREDIgZEDIgYEDEgYkDEgIgBEQMiBkQMiBgQMSBiQMSAiAERAyIGRAyIGBAxIGJAxICIAREDIgZEDIgYEDEgYkDEgIgBEQMiBkQMiBgQMSBiQMSAiAERAyIGRAyIGBAxIGJAxICIAREDIgZEDIgYEDEgYkDEgIgBEQMiBkQMiBgQMSBiQMSAiAERAyIGRAyIGBAxIGJAxICIAREDIgZEDIgYEDEgYkDEgIgBEQMiBkQMiBgQMSBiQMSAiAERAyIGRAyIGBAxIGJAxICIgWNmDXssMSBiQMTAAwAA///jnp7qAAAABklEQVQDAOhuBNrlihpdAAAAAElFTkSuQmCC
    }
    sessionId : <string>
}