LayerRender should turn off stencil/scissor after drawing layers to avoid affecting subsequent GL operations.
Created attachment 130825 [details] the patch
Comment on attachment 130825 [details] the patch LGTM.
Comment on attachment 130825 [details] the patch Clearing flags on attachment: 130825 Committed r110170: <http://trac.webkit.org/changeset/110170>
All reviewed patches have been landed. Closing bug.