Adds a special case for sending an int over a port with the native API.

runtime/vm/native_message_handler.cc

Index: runtime/vm/native_message_handler.cc
diff --git a/runtime/vm/native_message_handler.cc b/runtime/vm/native_message_handler.cc
index 8f8d7a6971c725426060d8f1a5aa9aa6d4666a95..e99caa5debe3ee22d3b456bdebf6d2571faf359e 100644
--- a/runtime/vm/native_message_handler.cc
+++ b/runtime/vm/native_message_handler.cc
@@ -42,9 +42,22 @@ MessageHandler::MessageStatus NativeMessageHandler::HandleMessage(
   // All allocation of objects for decoding the message is done in the
   // zone associated with this scope.
   ApiNativeScope scope;
-  ApiMessageReader reader(message->data(), message->len());
-  Dart_CObject* object = reader.ReadMessage();
-  (*func())(message->dest_port(), object);
+
+  if (message->IsRaw()) {
+    // TODO(zra): This should be folded into ApiMessageReader. This will likely
+    // require ApiMessageReader to have a constructor that takes a Message*.
+    ASSERT(ApiObjectConverter::CanConvert(message->raw_obj()));
+    Dart_CObject object;
+    bool success = ApiObjectConverter::Convert(message->raw_obj(), &object);
+    ASSERT(success);
+    (*func())(message->dest_port(), &object);
+  } else {
+    Dart_CObject* object;
+    ApiMessageReader reader(message->data(), message->len());
+    object = reader.ReadMessage();
+    (*func())(message->dest_port(), object);
+  }
+
   delete message;
   return kOK;
 }