Chrome Version: HEAD
OS: ALL

https://uma.googleplex.com/p/chrome/histograms/?endDate=latest&dayCount=28&histograms=DiskCache.0.TotalIOTime%2CHistogram.BadConstructionArguments&fixupData=true&showMax=true&filters=channel%2Ceq%2C1%2Cisofficial%2Ceq%2CTrue&implicitFilters=isofficial

The DiskCache.?.TotalIOTime histogram is being constructed with bad parameters.  It's being created here:
https://cs.chromium.org/chromium/src/net/disk_cache/blockfile/in_flight_backend_io.cc?rcl=831ab73d348a57b29bb9faf67b4e3e40f43aabb8&l=74

This has a minimum value of zero but histograms need to have a specified minimum value of one.  Zero is always allowed and is an implied bucket.  This will crash if it happens with DCHECKs enabled.

The comment here is incorrect:
https://cs.chromium.org/chromium/src/net/disk_cache/blockfile/histogram_macros.h?rcl=831ab73d348a57b29bb9faf67b4e3e40f43aabb8&l=84