Check in test specs for Ubuntu Trusty bots

BUG=349236
R=sky@chromium.org

Review URL: https://codereview.chromium.org/264973015

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@268213 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Add sandbox_mac_unittests to the chromium.mac and chromium_trybot recipes.

BUG=367863

Review URL: https://codereview.chromium.org/257193002

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@268279 4ff67af0-8c30-449e-8e8b-ad334ec8d88c