Allow proper highlighting on universal overflow scroll.

Source/core/rendering/RenderLayer.h

Index: Source/core/rendering/RenderLayer.h
diff --git a/Source/core/rendering/RenderLayer.h b/Source/core/rendering/RenderLayer.h
index db245b0ff9af5eafdefe7a895e8671abb8923742..a7217a4065062ab9b04381055ecdf5111bae06ec 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -177,6 +177,13 @@ public:
 
     const LayoutSize& offsetForInFlowPosition() const { return m_offsetForInFlowPosition; }
 
+    enum PresenceOfBlockSelectionGaps {
+        LayerHasBlockSelectionGaps,
+        LayerDoesNotHaveBlockSelectionGaps
+    };
+
+    PresenceOfBlockSelectionGaps rendererHasBlockSelectionGaps();

[Ian Vollick, 2014/06/05 18:28:41]

Can you replace the implementation of hasBlockSelectionGapBounds instead of
creating a very similar function here?

[hartmanng, 2014/06/05 20:28:03]

Done.

+    void blockSelectionGapsBoundsChanged();
     void addBlockSelectionGapsBounds(const LayoutRect&);
     void clearBlockSelectionGapsBounds();
     void repaintBlockSelectionGaps();