Add -fvisibility=default to metrics library

BUG=chromium:315243
TEST=x86-generic-full and daisy-full trybots pass

Change-Id: Ia1f2d41ddf0e54beee0a928bc62b67edd71ac706
Reviewed-on: https://chromium-review.googlesource.com/175770
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Liam McLoughlin <lmcloughlin@chromium.org>
Tested-by: Liam McLoughlin <lmcloughlin@chromium.org>
1 file changed
tree: 45e5b3ec683feb11b3d905fa3f2200ea271e50ff
  1. metrics/