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This is a reland of 70034734, the original
change was reverted because crashpad code is not MSan-safe (crbug.com/932205).
Instead, land the Linux-specific code but don't enable it yet until crashpad
is made MSan safe.

Original change's description:
> GWP-ASan: Add Linux crash handler support
>
> Linux crashpad support is now sufficiently enabled to allow running the
> GWP-ASan crash handler unit tests under Linux. (The client tests are
> still blocked on allocator shim updates.)
>
> Change-Id: I409cebaa9cdaed5da546266d0af470d2b25a09ab
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610605
> Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
> Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
> Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#659296}

TBR=vitalybuka@chromium.org

Change-Id: Ic8d8b48728382f747b7635e4df0eec3ca8e34680
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625916
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662395}