1444900 - Support startup and restart profiling for Fennec/geckoview

Status: NEW

(Core :: Gecko Profiler, enhancement, P3)

Description

[Randell Jesup [:jesup] (needinfo me)]

It should be "reasonably easy" (and well-documented!) how to profile Fennec and GeckoView startup and restart (after being harvested for memory by the system), and not have to "race" the system to tell it to dump the profile before the captured data falls off the circular buffer - basically fill-and-stop-when-full, not fill-and-overwrite-when-full (the normal profiler mode).

This type of mode is useful on desktop too, but less critical since restart isn't an issue, and for startup one can just crank the buffers size up as far as you want.