0. Start chromium, navigate to about:tracing (this is just for about:tracing, the bug is perhaps present on all platforms) 1. Navigate to http://www.florajs.com/demos/flap.html in another tab 2. Record a trace, observe it's mostly JS and style recalculation 3. Open DevTools on the demo page 4. Record another trace. 5. Observe we spend 8-9ms per frame in LayerTreeHost::updateLayers now
Created attachment 175754 [details] Patch
Committed r135571: <http://trac.webkit.org/changeset/135571>