Why Does My Chrome Have a 90GB PNG File in Virtual Mem for Whispernet Proxy?

Apparently that's a PNaCl program, that for some reason got a .PNG extension: https://chromium.googlesource.com/chromium/src.git/+/master/...

and whispernet-proxy doesn't show in the list because it is a extension that ships with chrome.

https://productforums.google.com/forum/#!topic/chrome/3qLYze...

It seems to have to do something with talking to nearby devices (by audio channels?) via the copresence API:

https://developer.chrome.com/apps/copresence

https://codereview.chromium.org/438513002/

That's what I could glean from a quick google search...