Added driver map getter

lib/Doctrine/DBAL/DriverManager.php

@@ -155,6 +155,16 @@ final class DriverManager
         return new $wrapperClass($params, $driver, $config, $eventManager);
     }
 
+    /**
+     * Returns the list of supported drivers and their mappings to the driver classes.
+     *
+     * @return array
+     */
+    public static function getDriverMap()
+    {
+        return self::$_driverMap;
+    }
+
     /**
      * Checks the list of parameters.
      *