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What does this do?
This implements JankStats. It copies a class from this sample project from google for testing purpose. It will log the jank stats when MainActivity goes into background. If it's possible you should test it with a lower spec device.
I tested this on a pixel 2 device and this were in the log.
JankStats: reason Activity pausedtotalFrames = 335 jankFrames = 11
Phabricator:
https://phabricator.wikimedia.org/T390624