Basic implementation of liveedit feature

src/debug-delay.js

Index: src/debug-delay.js
diff --git a/src/debug-delay.js b/src/debug-delay.js
index 55c25a926cbe754c1655e31e6e55aa1a48b161e7..3bf1061df0271dfa8484d266527a7d87825524b9 100644
--- a/src/debug-delay.js
+++ b/src/debug-delay.js
@@ -1251,7 +1251,9 @@ DebugCommandProcessor.prototype.processDebugJSONRequest = function(json_request)
       } else if (request.command == 'version') {
         this.versionRequest_(request, response);
       } else if (request.command == 'profile') {
-        this.profileRequest_(request, response);
+          this.profileRequest_(request, response);
+      } else if (request.command == 'changelive') {
+          this.changeLiveRequest_(request, response);
       } else {
         throw new Error('Unknown command "' + request.command + '" in request');
       }
@@ -1954,6 +1956,43 @@ DebugCommandProcessor.prototype.profileRequest_ = function(request, response) {
 };
 
 
+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;
+  }
+  
+  var change_log = new Array();
+  Debug.LiveEditChangeScript(the_script, change_pos, change_len, new_string,
+                             change_log);
+      
+  response.body = {change_log: change_log};
+};
+
+
 // Check whether the previously processed command caused the VM to become
 // running.
 DebugCommandProcessor.prototype.isRunning = function() {