GitLab

This is a reland of dcea6896 once the
headless_browsertests issue in https://crbug.com/929873 has been fixed.

CQ-DEPEND=CL:1460068

Original change's description:
> Add GWP-ASan hook to macOS crashpad handler
>
> Add the GWP-ASan UserStreamDataSource to the macOS crashpad handler.
> The GWP-ASan hook determines when an exception is related to GWP-ASan
> and reports additional debug information.
>
> Bug: 912286
> Change-Id: I1cd0227ca8aade1bd17e25b83832cdb8f3e58d5e
> Reviewed-on: https://chromium-review.googlesource.com/c/1457461
> Reviewed-by: Mark Mentovai <mark@chromium.org>
> Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#629881}

Bug: 912286
Change-Id: I9cac247b9e9b81c97f16da74dc95f21de6f9d6e6
Reviewed-on: https://chromium-review.googlesource.com/c/1460120Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630584}