Respect use_frozen_dicts option in workers

synapse/app/pusher.py

@@ -36,6 +36,8 @@ from synapse.util.manhole import manhole
 from synapse.util.rlimit import change_resource_limit
 from synapse.util.versionstring import get_version_string
 
+from synapse import events
+
 from twisted.internet import reactor, defer
 from twisted.web.resource import Resource
 
@@ -239,6 +241,8 @@ def start(config_options):
 
     setup_logging(config.worker_log_config, config.worker_log_file)
 
+    events.USE_FROZEN_DICTS = config.use_frozen_dicts
+
     if config.start_pushers:
         sys.stderr.write(
             "\nThe pushers must be disabled in the main synapse process"