Failing because of image diff. First occurrence seems to be https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7/builds/53365

(sorry, wrong link in the previous comment which I deleted to avoid confusion)

+Nate

Could this be related to changes to HTMLPluginElement in https://codereview.chromium.org/2949873005 ? It landed shortly before the flakes started.

It starts to failing on Linux debug:
https://build.chromium.org/p/chromium.webkit/waterfall?builder=WebKit%20Linux%20Trusty%20(dbg)

I will mark this test as flaky for now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e7bcba3e619827d5f86e5a77257b104b143c2d28

commit e7bcba3e619827d5f86e5a77257b104b143c2d28
Author: Xida Chen <xidachen@chromium.org>
Date: Fri Jun 23 15:25:06 2017

Mark plugins/iframe-plugin-bgcolor.html as flaky

TBR=msramek@chromium.org
NOTRY=true

Bug:  736333 
Change-Id: Ibc07aa373a6dd7c779705d10dec8efc26ebd8a15
Reviewed-on: https://chromium-review.googlesource.com/545995
Reviewed-by: Xida Chen <xidachen@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481894}
[modify] https://crrev.com/e7bcba3e619827d5f86e5a77257b104b143c2d28/third_party/WebKit/LayoutTests/TestExpectations

Looks paint-related?

japhet@, could you look into this ASAP. It seems possible that the test regression is showing a real problem and we want to be sure that is not the case.