Readd tests that still fail after r155911

-Acid3 outputs the elapsed time when the test fails.
-fast/dom/Window/open-window-min-size.html is just flaky.
-http/tests/misc/slow-loading-image-in-pattern.html loads
acid3-expected.png...WTH? Will fix this in a followup patch.

TBR=jochen@chromium.org,adamk@chromium.org

Review URL: https://codereview.chromium.org/22776004

git-svn-id: svn://svn.chromium.org/blink/trunk@155913 bbb929c8-8fbe-4397-9dbb-9b2b20218538