fast/sub-pixel/float-containing-block-with-margin.html doesn't need to be a pixel test, convert it to a text one.
Created attachment 169680 [details] Patch
Created attachment 169694 [details] Patch
Comment on attachment 169694 [details] Patch Attachment 169694 [details] did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/14460693 New failing tests: fast/sub-pixel/file-upload-control-at-fractional-offset.html
Comment on attachment 169694 [details] Patch LGTM.
Committed r132077: <http://trac.webkit.org/changeset/132077>