diff --git a/layout/base/FrameLayerBuilder.cpp b/layout/base/FrameLayerBuilder.cpp
index f46bb6245db2..aa44cc0c487e 100644
--- a/layout/base/FrameLayerBuilder.cpp
+++ b/layout/base/FrameLayerBuilder.cpp
@@ -2750,6 +2750,7 @@ ContainerState::ProcessDisplayItems(nsDisplayList* aList,
   }
 
   aList->AppendToTop(&savedItems);
+  aList->SetDidComputeVisibility();
 }
 
 void
diff --git a/layout/base/nsDisplayList.h b/layout/base/nsDisplayList.h
index a2f11ed44d06..253edaf3cd8a 100644
--- a/layout/base/nsDisplayList.h
+++ b/layout/base/nsDisplayList.h
@@ -1704,10 +1704,21 @@ public:
   bool DidComputeVisibility() const { return mDidComputeVisibility; }
 #endif
 
+  void SetDidComputeVisibility()
+  {
+#if defined(DEBUG) || defined(MOZ_DUMP_PAINTING)
+    mDidComputeVisibility = true;
+#endif
+  }
   void SetIsOpaque()
   {
     mIsOpaque = true;
   }
+  void SetNeedsTransparentSurface()
+  {
+    mForceTransparentSurface = true;
+  }
+
   nsRect GetVisibleRect() const { return mVisibleRect; }
 
 private: