Adding gcm_unit_tests on Mac buildbots

testing/buildbot/chromium.mac.json

Index: testing/buildbot/chromium.mac.json
diff --git a/testing/buildbot/chromium.mac.json b/testing/buildbot/chromium.mac.json
index ee20bd223053f6d6bdc0bf311421863b0fa26391..e095afe6e85d34814c5cce91e2eb7923fd7d1cf7 100644
--- a/testing/buildbot/chromium.mac.json
+++ b/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",