Without Cygwin, it cannot find ImageDiff executable.
Created attachment 326495 [details]
Comment on attachment 326495 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=326495&action=review
> + """Return current platform is Cygwin or not"""
Perhaps change this to "Return whether current platform is Cygwin or not".
Created attachment 326501 [details]
Created attachment 326504 [details]
Comment on attachment 326504 [details]
Clearing flags on attachment: 326504
Committed r224656: <https://trac.webkit.org/changeset/224656>
All reviewed patches have been landed. Closing bug.