I sent a change to the CQ [1] today and it failed due to a layout test dependency check failure in win_chromium_rel_ng. From the logs [2] it seems to be due to invalid DPI settings:

06:51:31.131 5844 "E:\b\build\slave\win\build\src\out\Release\content_shell.exe --check-layout-test-sys-deps" took 0.20s
06:51:31.131 5844 System dependencies check failed.
06:51:31.131 5844 To override, invoke with --nocheck-sys-deps
06:51:31.131 5844 
06:51:31.131 5844 Must use normal size fonts (96 dpi).

Must use either the Aero or Basic theme.

06:51:31.131 5844 
06:51:31.131 5844 For complete build requirements, please see:
06:51:31.131 5844 http://www.chromium.org/developers/how-tos/build-instructions-windows
06:51:31.131 5844 
06:51:31.131 5844 Testing completed, Exit status: 252


[1] https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.org/2109633002/140001

[2] https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_ng/builds/252110/steps/webkit_tests%20%28with%20patch%29/logs/stdio