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This is to enable performance measurements of individual optimisations
on stack tracing.

To provide useful debugging information, Arm's Memory Tagging Extension
(MTE) requires capturing stack traces on each allocation, therefore
unwinding is a performance-sensitive operation.  We're also planning to
change Chrome's unwinders for MTE's complementary technologies (PAC and
BTI). This test will help us measure the impact of these various flags
and changes, check for regressions, and help us find optimizations.

Bug: 1137393

Change-Id: I768c2dcf2cacdc5bba2cdec81d973b87ba3d4ea0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621832
Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845185}