Issue 611046 was a serious regression that remained unnoticed in the tree for almost a week. A better pixel test is needed which would have caught it.
If this would be best added on the GPU bots, which scrape the screen rather than relying on the test harness's readback mechanism, I'll be happy to help add it there. Otherwise, let's design and add a layout test for it.
Comment 1 by wangxianzhu@chromium.org
, May 12 2016