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

src/debug-debugger.js

Index: src/debug-debugger.js
diff --git a/src/debug-debugger.js b/src/debug-debugger.js
index c296e422d842e14a9f180d1bbd9fecd034a4d176..060e159f33de9aa8e0ae30692dde3dffc6d5afd1 100644
--- a/src/debug-debugger.js
+++ b/src/debug-debugger.js
@@ -1966,14 +1966,7 @@ DebugCommandProcessor.prototype.changeLiveRequest_ = function(request, response)
     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;
@@ -1987,10 +1980,32 @@ DebugCommandProcessor.prototype.changeLiveRequest_ = function(request, response)
     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