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This change breaks up the UNKNOWN_FAILURE bucket into more detailed
values so that we can better determine where errors are happening.

Bug: chromium:902923
Change-Id: I814466b081ce5ad0371fff7cd843ed8dd9e9c2e5
Reviewed-on: https://chromium-review.googlesource.com/c/1340976
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611369}