checkLayout() should error out if no data-expected* attributes were found
https://bugs.webkit.org/show_bug.cgi?id=114900

Reviewed by Ojan Vafai.

If checkLayout() doesn't find any attributes checking the node's layout then error out
instead of assuming the test has passed. This will ensure data-* attributes containing
typos don't register as a pass.

* fast/check-layout-error-no-attributes-expected.txt: Added.
* fast/check-layout-error-no-attributes.html: Added.
* resources/check-layout.js:
(.):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148973 268f45cc-cd09-0410-ab3c-d52691b4dbfc