Check existence of the window.eventSender object in layout test environment on different WebKit ports.
DISCLAIMER: this patch is not intended to be committed. It is here to utilize EWS system.
Created attachment 181913 [details]
Comment on attachment 181913 [details]
Attachment 181913 [details] did not pass mac-ews (mac):
New failing tests:
To make it clear, only Mac and Chromium bots run tests.