[2.0] Adding getDrivers() method to DriverChain

lib/Doctrine/ORM/Mapping/Driver/DriverChain.php

@@ -56,6 +56,16 @@ class DriverChain implements Driver
         $this->_drivers[$namespace] = $nestedDriver;
     }
 
+    /**
+     * Get the array of nested drivers
+     *
+     * @return array $drivers
+     */
+    public function getDrivers()
+    {
+        return $this->_drivers;
+    }
+
     /**
      * Loads the metadata for the specified class into the provided container.
      *