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Google collects profiles from user devices fleet-wide on both Android and ChromeOS. That's why code like this exists:

https://github.com/google/perf_data_converter/tree/master/sr...

Fun fact, I wrote the first version of this code as a Google Intern. Imagine my surprise when I saw that they're still using it, and it's been developed and fleshed out!

(as a historical aside, the name is "Quipper" because I kept trying to pronounce the project name (ChromeOS-Wide Profiling, or CWP) and ended up quite liking "Quip".

The internal aggregation code, of course, is known as Bartlett.

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