Adding gcm_unit_tests on Mac buildbots

R=zea@chromium.org

BUG=341513

Review URL: https://codereview.chromium.org/228553003

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@262932 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Move the complete list of tests to run to src repo

BUG=317931
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/228823004

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@262972 4ff67af0-8c30-449e-8e8b-ad334ec8d88c