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This is a reland of 409ceb85

Original change's description:
> GWP-ASan: Add crash handler hook.
>
> After a GWP-ASan exception occurs, a crash handler hook (e.g. a crashpad
> UserStreamDataSource) is responsible for looking at the crash and
> 1) determining if the exception was related to GWP-ASan, and 2) adding
> additional debug information to the minidump if so.
>
> The crash handler hook determines if the exception was related to
> GWP-ASan by finding the AllocatorState address (using a crash key),
> reading the allocator state and seeing if the exception occurred in the
> bounds of the allocator region. If it did, we extract debug information
> about that allocation and report it in the minidump.
>
> CQ-DEPEND=CL:1339246
>
> Bug: 896019
> Change-Id: I63d12b5137098b20ec946e3bddbdcabaf20e430a
> Reviewed-on: https://chromium-review.googlesource.com/c/1330283
> Reviewed-by: Mark Mentovai <mark@chromium.org>
> Reviewed-by: Brian White <bcwhite@chromium.org>
> Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#611033}

TBR=bcwhite@chromium.org

Bug: 896019
Change-Id: Ibc35c33ccc816cd2436412e2c6f399908161e7e1
Reviewed-on: https://chromium-review.googlesource.com/c/1351935
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611337}