Fix for issue 21398 (only send "literal like" objects across isolates spawned using spawnURI

runtime/vm/object.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 VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 7229 matching lines @@
  private:
   FINAL_HEAP_OBJECT_IMPLEMENTATION(ReceivePort, Instance);
   friend class Class;
 };
 
 
 class SendPort : public Instance {
  public:
   Dart_Port Id() const { return raw_ptr()->id_; }
 
+  Dart_Port origin_id() const { return raw_ptr()->origin_id_; }
+  void set_origin_id(Dart_Port id) const {
+    ASSERT(origin_id() == 0);
+    StoreNonPointer(&(raw_ptr()->origin_id_), id);
+  }
+
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawSendPort));
   }
-  static RawSendPort* New(Dart_Port id, Heap::Space space = Heap::kNew);
+  static RawSendPort* New(Dart_Port id,
+                          Heap::Space space = Heap::kNew);
+  static RawSendPort* New(Dart_Port id,
+                          Dart_Port origin_id,
+                          Heap::Space space = Heap::kNew);
 
  private:
   FINAL_HEAP_OBJECT_IMPLEMENTATION(SendPort, Instance);
   friend class Class;
 };
 
 
 // Internal stacktrace object used in exceptions for printing stack traces.
 class Stacktrace : public Instance {
  public:
@@ skipping 426 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_