Policy Frontend Extension
The exposed Android MediaBrowserService class. If the sourcePackageName provides a single media browser service, or the policyProvider should be used for all media browser services in the sourcePackageName, then this can be kept at its default of
null. In this case the policy will be applied to all services of sourcePackageName which have the intent filter MediaBrowserService.SERVICE_INTERFACE.
The policies to apply for the given source.