This CL introduces Promises/A+ tests[1].
This CL doesn't contain the test itself: it will be downloaded by test cfg.py.
This CL includes some helper JS functions to run the test in d8 shell.

[1]: https://github.com/promises-aplus/promises-tests

BUG=347095
LOG=Y
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/196733002

Patch from Yutaka Hirano <yhirano@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19973 ce2b1a6d-e550-0410-aec6-3dcde31c8c00