Created attachment 40112 [details]
IWebUIDelegatePrivate2::drawBackground can be used to draw a custom background into a WebView. But when that custom background changes, we need a way to tell WebView to invalidate its backing store so we can redraw the background. We should add SPI to do this.
Comment on attachment 40112 [details]
Committed r48754: <http://trac.webkit.org/changeset/48754>