Test for Bugs 39295 and 39297

This is a combined test for Bug 39295: Crash (preceded by assertion) in WKCACFLayerRenderer::setNeedsDisplay when computer wakes from sleep on particular page and Bug 39297: WebView doesn't repaint until page reloads when page using hardware acceleration loads just after waking from sleep. To test, put your computer to sleep (or "Standby", as Windows calls it). When you wake your computer up, the browser should not crash and the animation below should still be running without any periods of non-painting of the WebView.