Open the attached timer.html in WebView, hit Ctrl+Alt+Del to open the block/switch user/logout Windows system screen, and then hit Esc to go back to the desktop. WebView will start dumping the following warnings:

...
WARNING: unexpected number (>2) of render frames in the queue: 64
сен 25, 2012 2:31:11 PM com.sun.webpane.platform.WebPage paint2GC
WARNING: unexpected number (>2) of render frames in the queue: 64
сен 25, 2012 2:31:11 PM com.sun.webpane.platform.WebPage paint2GC
WARNING: unexpected number (>2) of render frames in the queue: 64
сен 25, 2012 2:31:11 PM com.sun.webpane.platform.WebPage paint2GC
WARNING: unexpected number (>2) of render frames in the queue: 64
сен 25, 2012 2:31:11 PM com.sun.webpane.platform.WebPage paint2GC
WARNING: unexpected number (>2) of render frames in the queue: 64
сен 25, 2012 2:31:12 PM com.sun.webpane.platform.WebPage paint2GC
WARNING: unexpected number (>2) of render frames in the queue: 64
сен 25, 2012 2:31:12 PM com.sun.webpane.platform.WebPage paint2GC
WARNING: unexpected number (>2) of render frames in the queue: 64
сен 25, 2012 2:31:12 PM com.sun.webpane.platform.WebPage paint2GC
WARNING: unexpected number (>2) of render frames in the queue: 64
сен 25, 2012 2:31:12 PM com.sun.webpane.platform.WebPage paint2GC
...

I believe this is a consequence of RT-23842