Add tests for sticky and various display values

Add tests for sticky and various display values, tests should show up all green.

BUG=231754

Review URL: https://codereview.chromium.org/178453002

git-svn-id: svn://svn.chromium.org/blink/trunk@168595 bbb929c8-8fbe-4397-9dbb-9b2b20218538