NEW 186051
Significant area painting milestone is often never fired on iPhone 
https://bugs.webkit.org/show_bug.cgi?id=186051
Summary Significant area painting milestone is often never fired on iPhone
Wenson Hsieh
Reported 2018-05-29 07:12:09 PDT
-_webView:renderingProgressDidChange: is rarely invoked with _WKRenderingProgressEventFirstPaintWithSignificantArea on iPhone, since the width of the relevantViewRect() used to determine how much of the page is painted is hard-coded to be 980.
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