Keep track of hashes triggered instead of builds.

scripts/slave/gatekeeper_ng_config.py

Index: scripts/slave/gatekeeper_ng_config.py
diff --git a/scripts/slave/gatekeeper_ng_config.py b/scripts/slave/gatekeeper_ng_config.py
index 75dc0cd75a5e1c720c1b3aa3d74e1694e9a4e50e..352f5efd5dd728a60a8cce46eb0bd244e664af5f 100755
--- a/scripts/slave/gatekeeper_ng_config.py
+++ b/scripts/slave/gatekeeper_ng_config.py
@@ -247,15 +247,16 @@ def inject_hashes(gatekeeper_config):
   return new_config
 
 
-def flatten_to_json(gatekeeper_config, stream):
-  # Python's sets aren't JSON-encodable, so we convert them to lists here.
-  class SetEncoder(json.JSONEncoder):
-    # pylint: disable=E0202
-    def default(self, obj):
-      if isinstance(obj, set):
-        return sorted(list(obj))
-      return json.JSONEncoder.default(self, obj)
+# Python's sets aren't JSON-encodable, so we convert them to lists here.
+class SetEncoder(json.JSONEncoder):
+  # pylint: disable=E0202
+  def default(self, obj):
+    if isinstance(obj, set):
+      return sorted(list(obj))
+    return json.JSONEncoder.default(self, obj)
+
 
+def flatten_to_json(gatekeeper_config, stream):
   json.dump(gatekeeper_config, stream, cls=SetEncoder, sort_keys=True)