Trace compilation during developer_extension_test.

runtime/observatory/tests/service/developer_extension_test.dart

Index: runtime/observatory/tests/service/developer_extension_test.dart
diff --git a/runtime/observatory/tests/service/developer_extension_test.dart b/runtime/observatory/tests/service/developer_extension_test.dart
index 85af448a2fe45072675c4a04c895a0ff857cf0ea..b4bafac342de253f9ac1057eef377f78b84ac21a 100644
--- a/runtime/observatory/tests/service/developer_extension_test.dart
+++ b/runtime/observatory/tests/service/developer_extension_test.dart
@@ -149,8 +149,8 @@ var tests = [
           'developer_extension_test.dart',
           'semicolon expected']));
     }
-
   },
 ];
 
-main(args) async => runIsolateTests(args, tests, testeeConcurrent:test);
+main(args) async => runIsolateTests(args, tests, testeeConcurrent:test,
+                                    trace_compiler: true);