[test specs] Record current_os and current_cpu

Change-Id: I02b65a6c7619c2856129ca32527fe95a8b035a36
diff --git a/testing/test_spec.gni b/testing/test_spec.gni
index cd4612d..1891032 100644
--- a/testing/test_spec.gni
+++ b/testing/test_spec.gni
@@ -135,6 +135,8 @@
     test = {
       name = get_label_info(":$target_name", "label_no_toolchain")
       location = invoker.location
+      os = current_os
+      cpu = current_cpu
     }
     environments = target_envs
   }