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This is a change in preparation of logging hang count histograms per
thread type.

Bug: 1135528
Change-Id: I96dc1e114ac170f5ff9a32eedd57dd19ea97b152
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505451
Commit-Queue: Oliver Li <olivierli@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821988}