src/vs/platform/userDataSync/common/userDataSyncIpc.ts/UserDataSyncStoreManagementServiceChannel/call
class UserDataSyncStoreManagementServiceChannel:	call(context: any, command: string, args?: any): Promise<any> {
		switch (command) {
			case 'switch': return this.service.switch(args[0]);
			case 'getPreviousUserDataSyncStore': return this.service.getPreviousUserDataSyncStore();
		}
		throw new Error('Invalid call');
	}