In the layer tree dump obtained via layoutTestController.layerTreeAsText(), the backgroundColor property is weirdly indented: (backfaceVisibility visible) (backgroundColor none) (transform identity)
Created attachment 53875 [details] Patch
Comment on attachment 53875 [details] Patch r=me
http://trac.webkit.org/changeset/57913
http://trac.webkit.org/changeset/57913 might have broken Qt Windows 32-bit Debug The following changes are on the blame list: http://trac.webkit.org/changeset/57909 http://trac.webkit.org/changeset/57910 http://trac.webkit.org/changeset/57911 http://trac.webkit.org/changeset/57913 http://trac.webkit.org/changeset/57914 http://trac.webkit.org/changeset/57915 http://trac.webkit.org/changeset/57916 http://trac.webkit.org/changeset/57917 http://trac.webkit.org/changeset/57918
I think this broke Snow Leopard.