Custom Trace Points in Studio for Jank Debugging

Studio has a special feature for Jank where you can highlight places we see frames that are longer than the window allows. You can go in and try to figure out what was happening during that time. There's a really cute, straightforward API for adding additional trace points. So if you have a spot in the Profetto trace where you're not sure what all is going on in your app during this time, you can add some of these trace point markers before and after any kind of interesting sub-sections or whatever.