应用: 百度地图
任务: 启动百度地图，点击打车，输入起点‘天安门广场’，终点‘鸟巢’
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: CLICK