应用: 今日头条
任务: 启动今日头条，进入视频频道，观看第一条视频
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: CLICK
step_id: 4
action: CLICK