If a plugin is occluded we should not treat it as non-visible, since it may be occluding itself with a fullscreen window! So for plugins we want to know, is the window visible OR occluded.
Created attachment 222610 [details]
Comment on attachment 222610 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=222610&action=review
> + // Return whether the view is visible, or occulded by another window.
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Committed revision 163061.