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

runtime/include/dart_api.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 INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
@@ skipping 595 matching lines @@
  * required (for example, if the isolate was created successfully by
  * Dart_CreateIsolate() but the root library fails to load
  * successfully, then the function should call Dart_ShutdownIsolate
  * before returning).
  *
  * When the function returns false, the function should set *error to
  * a malloc-allocated buffer containing a useful error message.  The
  * caller of this function (the vm) will make sure that the buffer is
  * freed.
  *
- * \param script_uri The uri of the script to load.  This uri has been
- *   canonicalized by the library tag handler from the parent isolate.
+ * \param script_uri The uri of the script to load.
+ *   This uri is non NULL if the isolate is being created using the
+ *   spawnUri isolate API. This uri has been canonicalized by the
+ *   library tag handler from the parent isolate.
  *   The callback is responsible for loading this script by a call to
  *   Dart_LoadScript or Dart_LoadScriptFromSnapshot.
+ *   This uri will be NULL if the isolate is being created using the
+ *   spawnFunction isolate API.
+ *   The callback is responsible for loading the script used in the
+ *   parent isolate by a call to Dart_LoadScript or
+ *   Dart_LoadScriptFromSnapshot.
  * \param main The name of the main entry point this isolate will
  *   eventually run.  This is provided for advisory purposes only to
  *   improve debugging messages.  The main function is not invoked by
  *   this function.
- * \param unhandled_exc The name of the function to this isolate will
- *   call when an unhandled exception is encountered.
  * \param callback_data The callback data which was passed to the
  *   parent isolate when it was created by calling Dart_CreateIsolate().
  * \param error A structure into which the embedder can place a
  *   C string containing an error message in the case of failures.
  *
  * \return The embedder returns NULL if the creation and
  *   initialization was not successful and the isolate if successful.
  */
 typedef Dart_Isolate (*Dart_IsolateCreateCallback)(const char* script_uri,
                                                    const char* main,
@@ skipping 1671 matching lines @@
  *
  * \param object An object.
  * \param peer A value to store in the peer field.
  *
  * \return Returns an error if 'object' is a subtype of Null, num, or
  *   bool.
  */
 DART_EXPORT Dart_Handle Dart_SetPeer(Dart_Handle object, void* peer);
 
 #endif  /* INCLUDE_DART_API_H_ */  /* NOLINT */