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

runtime/vm/isolate.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "lib/mirrors.h"
@@ skipping 950 matching lines @@
 
 
 template<class T>
 T* Isolate::AllocateReusableHandle() {
   T* handle = reinterpret_cast<T*>(reusable_handles_.AllocateScopedHandle());
   T::initializeHandle(handle, T::null());
   return handle;
 }
 
 
-static char* GetRootScriptUri(Isolate* isolate) {
-  const Library& library =
-      Library::Handle(isolate->object_store()->root_library());
-  ASSERT(!library.IsNull());
-  const String& script_name = String::Handle(library.url());
-  return isolate->current_zone()->MakeCopyOfString(script_name.ToCString());
-}
-
-
 IsolateSpawnState::IsolateSpawnState(const Function& func,
                                      const Function& callback_func)
     : isolate_(NULL),
       script_url_(NULL),
       library_url_(NULL),
       function_name_(NULL),
       exception_callback_name_(NULL) {
-  script_url_ = strdup(GetRootScriptUri(Isolate::Current()));
+  script_url_ = NULL;
   const Class& cls = Class::Handle(func.Owner());
   ASSERT(cls.IsTopLevel());
   const Library& lib = Library::Handle(cls.library());
   const String& lib_url = String::Handle(lib.url());
   library_url_ = strdup(lib_url.ToCString());
 
   const String& func_name = String::Handle(func.name());
   function_name_ = strdup(func_name.ToCString());
   if (!callback_func.IsNull()) {
     const String& callback_name = String::Handle(callback_func.name());
@@ skipping 53 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(isolate());
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart