Activate the first two renderers to participate in the LBSE render tree: RenderSVGRoot and RenderSVGRect. Layer creation, and making RenderSVGModelObject layer-aware comes later.
Created attachment 446710 [details] Patch, v1
Created attachment 446711 [details] Patch, v2
Committed r286846 (245079@trunk): <https://commits.webkit.org/245079@trunk>
<rdar://problem/86318738>