Add measure on check_host_in_room

synapse/api/auth.py

@@ -278,6 +278,7 @@ class Auth(object):
 
     @defer.inlineCallbacks
     def check_host_in_room(self, room_id, host):
+        with Measure(self.clock, "check_host_in_room"):
             curr_state_id = yield self.state.get_current_state_ids(room_id)
 
             for (etype, state_key), event_id in curr_state_id.items():