Implementing Serializable so that continuations captured within a "with" block can be serialized.

js/rhino/src/org/mozilla/javascript/NativeWith.java

@@ -36,13 +36,17 @@
 
 package org.mozilla.javascript;
 
+import java.io.Serializable;
+
 /**
  * This class implements the object lookup required for the
  * <code>with</code> statement.
  * It simply delegates every action to its prototype except
  * for operations on its parent.
  */
-public class NativeWith implements Scriptable, IdFunctionCall {
+public class NativeWith implements Scriptable, IdFunctionCall, Serializable {
+    
+    private static final long serialVersionUID = 1L;
 
     static void init(Scriptable scope, boolean sealed)
     {