VM: [Kernel] Fix bootstraping when Kernel isolate is used.

runtime/vm/dart_api_message.cc

Index: runtime/vm/dart_api_message.cc
diff --git a/runtime/vm/dart_api_message.cc b/runtime/vm/dart_api_message.cc
index 4d3687f3909b1bb9194502ffed912a58582a5356..6e1afc487b48f560cbe7304ff5a77e8afa364b0a 100644
--- a/runtime/vm/dart_api_message.cc
+++ b/runtime/vm/dart_api_message.cc
@@ -1284,6 +1284,14 @@ bool ApiMessageWriter::WriteCObjectInlined(Dart_CObject* object,
       WriteRawPointerValue(reinterpret_cast<intptr_t>(callback));
       break;
     }
+    case Dart_CObject_kSendPort: {
+      WriteInlinedHeader(object);
+      WriteIndexedObject(kSendPortCid);
+      WriteTags(0);
+      Write<int64_t>(object->value.as_send_port.id);
+      Write<uint64_t>(object->value.as_send_port.origin_id);
+      break;
+    }
     case Dart_CObject_kCapability: {
       WriteInlinedHeader(object);
       WriteIndexedObject(kCapabilityCid);