Add a LayoutTest for RSA-PSS, and add the algorithm name to lookup table.

The omission of RSA-PSS from the algorithm name lookup table was a mistake in my earlier change. I have added a compile-time assert to catch this problem in the future.

BUG=399090

Review URL: https://codereview.chromium.org/671553003

git-svn-id: svn://svn.chromium.org/blink/trunk@184606 bbb929c8-8fbe-4397-9dbb-9b2b20218538