[test-infra] add option to just dump JSON to a textarea (#803)

This adds a runner option to have the JSON dumped to a big textarea. It is meant as a last recourse option when that's the only way that any JSON will get produced by the tool.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/803

Received on Wednesday, 26 March 2014 16:33:50 UTC