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Recorded when iOS app has started after a crash caused by system signal
or hang. Not recorded when app has started after UTE or XTE. See
go/bling-stability-101 for imformation about signal crashes, hangs, UTEs
and XTEs. This metric intends to compliment Stability.Counts.
Stability.Counts does include UTEs / XTEs and thus is a noisy metric
which significantly overcounts user-visible crashes.
Stability.IOS.Experimental.Counts is not recorded on OOM crashes, so it
does not represent all use-visible crashes, but OOMs are so rare in
Chrome for iOS that Stability.IOS.Experimental.Counts is still a good
proxy for user-visible crashes. IOS.MetricKit.ForegroundExitData
includes OOM crashes and can be used in conjunction with this metric.

Bug: 1166922
Change-Id: I390a2da2b8b9ed81d215ce58375911019c2228dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631287
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844349}