Add more info to compositing log channel output
https://bugs.webkit.org/show_bug.cgi?id=115978

Reviewed by Dean Jackson.

Add to compositing log channel output whether a layer paints
into its compositing ancestor.

* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::logLayerInfo):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149950 268f45cc-cd09-0410-ab3c-d52691b4dbfc