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This is a reland of 07c000ce

This CL fixes use of initialized memory which was detected by msan.

Original change's description:
> Fix thread checks in HangWatcher
>
> Remove the thread check that would never pass and make the variable
> that is used by multiple threads thread safe.
>
> Bug: 1142155
> Change-Id: Iae33e15733eb78a47a664515e1abec671edbb64d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495579
> Reviewed-by: François Doray <fdoray@chromium.org>
> Commit-Queue: Oliver Li <olivierli@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820817}

Bug: 1142155
Change-Id: I9b642bacbf8b801cd3a549c642c1687449edab86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502748Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Oliver Li <olivierli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821385}