Config the localStorage backend, using options set in the config.
function _initStorage( options ) {
	const dbInfo = {};
	if ( options ) {
		for ( const i in options ) {
			dbInfo[ i ] = options[ i ];
		}
	}

	dbInfo.db = {};
	dummyStorage[ dbInfo.name ] = dbInfo.db;

	this._dbInfo = dbInfo;
	return Promise.resolve();
}