Allow logging of HangWatcher histograms without crash dumping.
This is done by defining logging levels instead of just activating complete hang watching per thread type. Hang watching a thread type can be : 1) Deactivated. 2) Logging metrics to UMA only. 3) DumpWithoutCrashing on finding a hang. Bug: 1135528 Change-Id: I98d04c24447129cd28e2d7d04ce26743e922fef3 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529192 Commit-Queue: Oliver Li <olivierli@chromium.org> Reviewed-by:François Doray <fdoray@chromium.org> Cr-Commit-Position: refs/heads/master@{#828506}
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