Describe LiveEdit changes and support preview mode

test/mjsunit/debug-liveedit-breakpoints.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 54 matching lines @@
 Debug.setScriptBreakPoint(Debug.ScriptBreakPointType.ScriptId, script.id, 1, 1, "true || false || false");
 Debug.setScriptBreakPoint(Debug.ScriptBreakPointType.ScriptId, script.id, 6, 1, "true || false || false");
 Debug.setScriptBreakPoint(Debug.ScriptBreakPointType.ScriptId, script.id, 14, 1, "true || false || false");
 
 assertEquals(3, Debug.scriptBreakPoints().length);
 
 var new_source = script.source.replace(function_z_text, "");
 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");
 
 var breaks = Debug.scriptBreakPoints();
 
 // One breakpoint gets duplicated in a old version of script.
 assertTrue(breaks.length > 3 + 1);
 
 var breakpoints_in_script = 0;
 var break_position_map = {};
 for (var i = 0; i < breaks.length; i++) {
   if (breaks[i].script_id() == script.id) {
     break_position_map[breaks[i].line()] = true;
     breakpoints_in_script++;
   }
 }
 
 assertEquals(3, breakpoints_in_script);
 
 // Check 2 breakpoints. The one in deleted function should have been moved somewhere.
 assertTrue(break_position_map[1]);
 assertTrue(break_position_map[11]);