[secure-contexts-tests] Add Web Platform Tests for Secure Contexts. (#3002)

MozReview-Commit-ID: JU2bzytnkkI

Upstreamed from https://bugzilla.mozilla.org/show_bug.cgi?id=1162772

View on GitHub: https://github.com/w3c/web-platform-tests/pull/3002

Received on Monday, 9 May 2016 21:17:21 UTC