According to the presentation video, it is a profiling tool used for Stadia Games ( https://www.youtube.com/watch?v=8V-EPBPGZPs ) that can adapt to Unity and Unreal Engine. Which seems to make sense as the original developer has experience developing on video games.

The main selling point of the tool is Dynamic instrumentation, which allows you to generate Flame charts without manual code annotation (you pick functions that you are interested into, and the profiler adds a hook to these functions in order to log the entry+exit time).

That’s what libprofiler does, too, sample the stack during runs.