WIP: backface visibility plumbing (not for review)

third_party/WebKit/Source/core/paint/ObjectPaintProperties.h

Index: third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
diff --git a/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h b/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
index fbdf7f7e5576ad397749e7ea2d1da195606d3d60..d1b9fbca76c720e05b1ac3ffa9d7afd22511251b 100644
--- a/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
+++ b/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
@@ -64,6 +64,9 @@ public:
     // at the right painting step.
     struct LocalBorderBoxProperties {
         LayoutPoint paintOffset;
+        // TODO(pdr): We should switch this to be just the paint property nodes (i.e.,
+        // 4 x RefPtr<PaintPropertyTreeNode>) because other PaintChunk-related data may
+        // be set at a different time than the paint property nodes.
         PaintChunkProperties properties;
     };
     LocalBorderBoxProperties* localBorderBoxProperties() const { return m_localBorderBoxProperties.get(); }