Describe LiveEdit changes and support preview mode

test/mjsunit/debug-liveedit-newsource.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 39 matching lines @@
 
 var script = Debug.findScript(ChooseAnimal);
 
 var new_source = script.source.replace("Cat", "Cap' + 'yb' + 'ara");
 var new_source = new_source.replace("25", "26");
 var new_source = new_source.replace("Help", "Hello");
 var new_source = new_source.replace("17", "18");
 print("new source: " + new_source);
 
 var change_log = new Array();
-Debug.LiveEdit.SetScriptSource(script, new_source, change_log);
+var result = Debug.LiveEdit.SetScriptSource(script, new_source, false, change_log);
+print("Result: " + JSON.stringify(result) + "\n");
 print("Change log: " + JSON.stringify(change_log) + "\n");
 
 assertEquals("Capybara", ChooseAnimal());
 // Global variable do not get changed (without restarting script).
 assertEquals(25, something1);
 // Function is oneliner, so currently it is treated as damaged and not patched.
 assertEquals(17, ChooseNumber());
 assertEquals("Hello Peter", ChooseAnimal.Factory()("Peter"));