遲遲等不到官方的更新通知，就自己下載ota檔sideload update了
Android O brings picture-in-picture support so you can watch YouTube while
hailing a Lyft 這篇文中（https://goo.gl/21QGc1）有提到：
“Picture-in-picture is just one of the handful of new features that come with
Android O today. Compatible devices for the preview include the Nexus 5X,
Nexus 6P, Nexus Player, Pixel, Pixel XL, and Pixel C.”
在設定裡頭也有確定picture in picture有開啟
開了兩個app來測試（hangouts, youtube）
想試驗邊用hangouts邊用picture in picture 看youtube的情景
在切換的視窗沒看到東西
在Youtube的視窗也是
試過單點、雙點recent, home, back 都失敗
有人有用nexus 5x 試成功嗎？