[test-infra] Add iframe support for test runner (#728)

This is to add test runner an optional feature of running tests in an iframe while keeping running tests in a top-level browsing context as default.
It makes the test runner work smoothly in Web Runtime, and benefits reftests and manual tests running on mobile devices by saving tab/window switching operations


View on GitHub: https://github.com/w3c/web-platform-tests/pull/728

Received on Friday, 7 March 2014 05:35:30 UTC