Allow 'empty' tests if a feature is not supported in the browser.
Allow 'empty' tests if a feature is not supported in the browser.

BUG=

Review URL: https://codereview.chromium.org//13046006

git-svn-id: b889c0189f1adfea19efba192a3d7a5b889e4120@20530 260f80e4-7a28-3924-810f-c04153c831b5

Pacane/test,grouma/test,d2m/test,d2m/test,Pacane/test,apwilson/test,grouma/test,kevmoo/test,apwilson/test,d2m/test,greglittlefield-wf/test,iglherme/Guttiest,iglherme/Guttiest,greglittlefield-wf/test,greglittlefield-wf/test,kevmoo/test,grouma/test,kevmoo/test,iglherme/Guttiest,apwilson/test