Repro steps: 1) Load the attached file in test_shell.exe. You should see a box rotated 20deg. 2) Drag the window off screen and back. 3) If you look carefully, you'll see that the edge is now a tiny bit different (a bit darker?). If you reload, the edges return to the lighter state. I suspect this is a problem in skia since I couldn't repro on mac. It's also hard to repro on Chromium because it saves a backing store of the image. It's the extra invalidate that causes the border to change.
Created attachment 84303 [details] test case
Can you post before/after screenshots of what you are seeing?
Created attachment 84314 [details] better test case
Created attachment 84315 [details] initial load
Created attachment 84316 [details] after invalidate
(In reply to comment #3) > Created an attachment (id=84314) [details] > better test case This shows a much more noticeable difference. The original test case only differed by a dozen pixels or so.
https://code.google.com/p/chromium/issues/detail?id=230544