We have some useful indicators that show which page elements get compositing layers. We should make them available in release builds (they are controlled by 'defaults' settings).
Created attachment 41524 [details] Patch
Comment on attachment 41524 [details] Patch > + * platform/graphics/mac/WebLayer.mm: > + (WebCore::if): Please don't leave a line like this in the change log. r=me
http://trac.webkit.org/changeset/49945