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

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/base_isolate.h"
@@ skipping 152 matching lines @@
 
   const char* name() const { return name_; }
 
   int64_t start_time() const { return start_time_; }
 
   Dart_Port main_port() const { return main_port_; }
   void set_main_port(Dart_Port port) {
     ASSERT(main_port_ == 0);  // Only set main port once.
     main_port_ = port;
   }
+  Dart_Port origin_id() const { return origin_id_; }
+  void set_origin_id(Dart_Port id) {
+    ASSERT((id == main_port_ && origin_id_ == 0) ||
+           (origin_id_ == main_port_));
+    origin_id_ = id;
+  }
   void set_pause_capability(uint64_t value) { pause_capability_ = value; }
   uint64_t pause_capability() const { return pause_capability_; }
   void set_terminate_capability(uint64_t value) {
     terminate_capability_ = value;
   }
   uint64_t terminate_capability() const { return terminate_capability_; }
 
   Heap* heap() const { return heap_; }
   void set_heap(Heap* value) { heap_ = value; }
   static intptr_t heap_offset() { return OFFSET_OF(Isolate, heap_); }
@@ skipping 443 matching lines @@
 
   static ThreadLocalKey isolate_key;
 
   StoreBuffer store_buffer_;
   ClassTable class_table_;
   MegamorphicCacheTable megamorphic_cache_table_;
   Dart_MessageNotifyCallback message_notify_callback_;
   char* name_;
   int64_t start_time_;
   Dart_Port main_port_;
+  Dart_Port origin_id_;  // Isolates created by spawnFunc have some origin id.
   uint64_t pause_capability_;
   uint64_t terminate_capability_;
   Heap* heap_;
   ObjectStore* object_store_;
   uword top_exit_frame_info_;
   void* init_callback_data_;
   Dart_EnvironmentCallback environment_callback_;
   Dart_LibraryTagHandler library_tag_handler_;
   ApiState* api_state_;
   StubCode* stub_code_;
@@ skipping 207 matching lines @@
   uint8_t* serialized_args_;
   intptr_t serialized_args_len_;
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
   bool paused_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_