Symbolize any stacktraces in DM and nanobench

As a soft rollout, this only affects the Linux NUCS
(on Ubuntu16).

BUG=skia:6206

Change-Id: Ic314e85159cd3c0d9e55bbdce412a8d61adebb33
Reviewed-on: https://skia-review.googlesource.com/8276
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
4 files changed