Only enable background tab responsiveness detection on Mac. This was only tested on Mac and it causes issues on iOS where background tabs may get suspended.
<rdar://problem/30913776>
Created attachment 304809 [details] Patch
Comment on attachment 304809 [details] Patch Attachment 304809 [details] did not pass mac-wk2-ews (mac-wk2): Output: http://webkit-queues.webkit.org/results/3351416 New failing tests: webrtc/peer-connection-remote-audio-mute2.html
Created attachment 304818 [details] Archive of layout-test-results from ews107 for mac-elcapitan-wk2 The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews. Bot: ews107 Port: mac-elcapitan-wk2 Platform: Mac OS X 10.11.6
Comment on attachment 304809 [details] Patch Clearing flags on attachment: 304809 Committed r214123: <http://trac.webkit.org/changeset/214123>
All reviewed patches have been landed. Closing bug.