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