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..5992016e2aa7ee99d6a6701b306d0c4e44dc7239 100644
--- a/runtime/vm/native_message_handler.cc
+++ b/runtime/vm/native_message_handler.cc
@@ -38,13 +38,21 @@ MessageHandler::MessageStatus NativeMessageHandler::HandleMessage(
     // We currently do not use OOB messages for native ports.
     UNREACHABLE();
   }
-  // We create a native scope for handling the message.
-  // 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->type() == Message::kDataType) {
+    // We create a native scope for handling the message.
+    // 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);
+  } else {
+    ASSERT(message->type() == Message::kIntegerType);
+    Dart_CObject integer;
+    integer.type = Dart_CObject_kInt64;
+    integer.value.as_int64 = message->integer();
+    (*func())(message->dest_port(), &integer);
+  }
   delete message;
   return kOK;
 }