YouTube Button As Add Notify Video To WL

Function:
1. Add clock appearance button to notify massage right-bottom that can add video to Watch Later Playlist.

How to use:
1. Click the clock appearance button.
2. Button will change icon after ask Youtube:
a. When response is success complete then button change to recycle bin, that can click again to remove video from WL.
b. When response is fail then button change to cross appearance, feedback to me , as long as I don't let YT stop me I'll fix it one day.