Captures clicks on the back and forward buttons when using the Browser Chrome patch.
给Browser Chrome模块上的返回／向前按钮创建交互。
输出口
Back 返回
A boolean that is true when the back button is clicked down.
单击“后退”按钮时，布尔值为真。
Forward 向前
A boolean that is true when the back button is clicked down. is down or not.
当返回按钮按下时布尔值为真。是否为按下。（板栗：啥啊！）
