Retain script path of parent isolate when spawnFunction is called so that

runtime/bin/isolate_data.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_ISOLATE_DATA_H_
 #define BIN_ISOLATE_DATA_H_
 
 #include "include/dart_api.h"
 #include "platform/globals.h"
 
 
 namespace dart {
 namespace bin {
 
 // Forward declaration.
 class EventHandler;
 
 // Data associated with every isolate in the standalone VM
 // embedding. This is used to free external resources for each isolate
 // when the isolate shuts down.
 class IsolateData {
  public:
-  IsolateData()
-      : object_array_class(NULL),
-        growable_object_array_class(NULL), immutable_array_class(NULL) {
+  explicit IsolateData(const char* url) : script_url(strdup(url)) {
+  }
+  ~IsolateData() {
+    free(script_url);
   }
 
-  Dart_PersistentHandle object_array_class;
-  Dart_PersistentHandle growable_object_array_class;
-  Dart_PersistentHandle immutable_array_class;
+  char* script_url;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(IsolateData);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_ISOLATE_DATA_H_