<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load_plugin_factories(self):
 """ Add any plugin toolkit widgets to the ANDROID_FACTORIES """

        for plugin in self.get_plugins(group='enaml_native_android_factories'):
            get_factories = plugin.load()
            PLUGIN_FACTORIES = get_factories()
            factories.ANDROID_FACTORIES.update(PLUGIN_FACTORIES)