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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/1330283Reviewed-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}