Let LiveEdit accept a full new script source (rather than diff)

src/debug-debugger.js

 // Copyright 2006-2008 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 1948 matching lines @@
 
 
 DebugCommandProcessor.prototype.changeLiveRequest_ = function(request, response) {
   if (!Debug.LiveEditChangeScript) {
     return response.failed('LiveEdit feature is not supported');
   }
   if (!request.arguments) {
     return response.failed('Missing arguments');
   }
   var script_id = request.arguments.script_id;
-  var change_pos = parseInt(request.arguments.change_pos);
-  var change_len = parseInt(request.arguments.change_len);
-  var new_string = request.arguments.new_string;
-  if (!IS_STRING(new_string)) {
-    response.failed('Argument "new_string" is not a string value');
-    return;
-  }
-
+  
   var scripts = %DebugGetLoadedScripts();
 
   var the_script = null;
   for (var i = 0; i < scripts.length; i++) {
     if (scripts[i].id == script_id) {
       the_script = scripts[i];
     }
   }
   if (!the_script) {
     response.failed('Script not found');
     return;
   }
 
+  // A function that calls a proper signature of LiveEdit API.  
+  var invocation;
+  
   var change_log = new Array();
+  
+  if (IS_STRING(request.arguments.new_source)) {
+    var new_source = request.arguments.new_source;
+    invocation = function() {
+      return Debug.LiveEdit.SetScriptSource(the_script, new_source, change_log);
+    }
+  } else {
+    var change_pos = parseInt(request.arguments.change_pos);
+    var change_len = parseInt(request.arguments.change_len);
+    var new_string = request.arguments.new_string;
+    if (!IS_STRING(new_string)) {
+      response.failed('Argument "new_string" is not a string value');
+      return;
+    }
+    invocation = function() {
+      return Debug.LiveEditChangeScript(the_script, change_pos, change_len,
+          new_string, change_log);
+    }
+  }
+
   try {
-    Debug.LiveEditChangeScript(the_script, change_pos, change_len, new_string,
-                               change_log);
+    invocation();
   } catch (e) {
     if (e instanceof Debug.LiveEditChangeScript.Failure) {
       // Let's treat it as a "success" so that body with change_log will be
       // sent back. "change_log" will have "failure" field set.
       change_log.push( { failure: true } );
     } else {
       throw e;
     }
   }
   response.body = {change_log: change_log};
@@ skipping 119 matching lines @@
     case 'string':
     case 'number':
       json = value;
       break
 
     default:
       json = null;
   }
   return json;
 }