Created attachment 252085 [details] patch Use the pageExtendedBackgroundColor for the background color of the WKView, if we have one (and aren't using a transparent background). This means during asynchronous resize or other cases where the Web process isn't keeping up with the UI process during a resize, we'll see background color instead of white.
Attachment 252085 [details] did not pass style-queue: ERROR: Source/WebKit2/ChangeLog:1: ChangeLog entry has no bug number [changelog/bugnumber] [5] Total errors found: 1 in 2 files If any of these errors are false positives, please file a bug against check-webkit-style.
http://trac.webkit.org/changeset/183647
Re-opened since this is blocked by bug 145326