Changing isolation CSS property should not trigger repaint in RenderStyle::changeRequiresLayerRepaint. This is not necessary because this property will possibly change if the layer is stacking context or not. And this stacking context state will trigger repaint if required.
Created attachment 230827 [details] Patch
Created attachment 230906 [details] Patch
Comment on attachment 230906 [details] Patch r=me
Comment on attachment 230906 [details] Patch Clearing flags on attachment: 230906 Committed r168465: <http://trac.webkit.org/changeset/168465>
All reviewed patches have been landed. Closing bug.