Adding gcm_unit_tests on Mac buildbots

R=zea@chromium.org

BUG=341513

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

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@262932 0039d316-1c4b-4281-b951-d872f2087c98

testing/buildbot/chromium.mac.json

@@ -24,6 +24,7 @@
   "Mac10.6 Tests (2)": {
     "gtest_tests": [
       "components_unittests",
+      "gcm_unit_tests",
       "gfx_unittests",
       "google_apis_unittests",
       "ipc_tests",
@@ -76,6 +77,7 @@
   "Mac10.7 Tests (2)": {
     "gtest_tests": [
       "components_unittests",
+      "gcm_unit_tests",
       "gfx_unittests",
       "google_apis_unittests",
       "ipc_tests",
@@ -139,6 +141,7 @@
   "Mac 10.6 Tests (dbg)(4)": {
     "gtest_tests": [
       "components_unittests",
+      "gcm_unit_tests",
       "google_apis_unittests",
       "message_center_unittests",
       "ipc_tests",
@@ -195,6 +198,7 @@
   "Mac 10.7 Tests (dbg)(4)": {
     "gtest_tests": [
       "components_unittests",
+      "gcm_unit_tests",
       "google_apis_unittests",
       "message_center_unittests",
       "ipc_tests",