Using urllib for SSL connections when behind a proxy is known to be
broken, so apply the same fix from depot_tools r149742 and use a wrapper
around urllib2 instead.

R=jkummerow@chromium.org
TEST=run test262 behind corporate proxy

Review URL: https://codereview.chromium.org/297663003

Patch from Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21402 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Fix GetSourceForTest which returned an incorrect result.
With this fix promises-aplus shows correct sources when --cat option is specified.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/258763002

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

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@21026 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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