Adding variable builder to tryserver.chromium.mac

masters/master.tryserver.chromium.mac/master.cfg

Index: masters/master.tryserver.chromium.mac/master.cfg
diff --git a/masters/master.tryserver.chromium.mac/master.cfg b/masters/master.tryserver.chromium.mac/master.cfg
index 4b5b4986c7dbcff3b0555bc6602dc8cc91a01479..60a10edecaff4400eff5e5f12ac24e851d66f34b 100644
--- a/masters/master.tryserver.chromium.mac/master.cfg
+++ b/masters/master.tryserver.chromium.mac/master.cfg
@@ -169,6 +169,17 @@ b_mac_nacl_sdk_build = {
   'factory': m_annotator.BaseFactory('nacl/sdk_build'),
 }
 
+# These variable builders are used by Findit to identify culprit commits for
+# compile or test failures on the main waterfall. They run on optional slaves
+# and NOT CQ slaves.
+variable_builders = [
+  {
+    'name': 'mac_chromium_variable',
+    'factory': m_annotator.BaseFactory('findit/chromium/compile'),
+    'slavebuilddir': 'mac'
+  }
+]
+
 c['builders'] = [
   b_ios_dbg_simulator_ninja,
   b_ios_rel_device_ninja,
@@ -178,7 +189,7 @@ c['builders'] = [
   b_ios_rel_device_gn,
   b_mac_nacl_sdk,
   b_mac_nacl_sdk_build,
-] + chromium_builders
+] + chromium_builders + variable_builders
 
 
 # Slaves are loaded from slaves.cfg.