[debugger] basic test infrastructure for new debugger test api.

test/debugger/test-api.js

Index: test/debugger/test-api.js
diff --git a/test/message/for-of-throw-in-body.js b/test/debugger/test-api.js
similarity index 81%
copy from test/message/for-of-throw-in-body.js
copy to test/debugger/test-api.js
index 38b27f38632520e292f66b7ab451df00c2c03b68..881e69209aa1602eea6f3aa09b0edacb2eca3830 100644
--- a/test/message/for-of-throw-in-body.js
+++ b/test/debugger/test-api.js
@@ -2,4 +2,4 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-for (var x of [1, 2, 3]) { throw 42 }
+// TODO: add test API implementation.