GitLab

Adds code to parse elf binary to get build id from
.note.gnu.build-id section. The build ID is needed to symbolize
heap dumps from the users.

BUG=734705

Change-Id: If4365e232c060ba96071ba1e1c43618f9807e39c
Reviewed-on: https://chromium-review.googlesource.com/1028995
Commit-Queue: Siddhartha S <ssid@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554304}