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 dc02ec312bbde7c89467c3f4bbcc666e399e43bd..86ba9a89d8c4fd42ccf6ae3bbe6c60fdfcc86629 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -177,10 +177,17 @@ public:
 
     const LayoutSize& offsetForInFlowPosition() const { return m_offsetForInFlowPosition; }
 
+    enum PresenceOfBlockSelectionGaps {
+        LayerHasBlockSelectionGaps,
+        LayerDoesNotHaveBlockSelectionGaps
+    };

[Ian Vollick, 2014/06/12 14:54:57]

I think you could just use a boolean and get rid of this enum. The enum would be
better if this were being passed into a function as a parameter, but a boolean
return value is fine, especially when the function is as clearly named as
hasBlockSelectionGapBounds is.

[hartmanng, 2014/06/13 14:51:38]

Done.

+
+    void blockSelectionGapsBoundsChanged();
     void addBlockSelectionGapsBounds(const LayoutRect&);
     void clearBlockSelectionGapsBounds();
     void repaintBlockSelectionGaps();
-    bool hasBlockSelectionGapBounds() const;
+    IntRect blockSelectionGapsBounds() const;
+    PresenceOfBlockSelectionGaps hasBlockSelectionGapBounds() const;
 
     RenderLayerStackingNode* stackingNode() { return m_stackingNode.get(); }
     const RenderLayerStackingNode* stackingNode() const { return m_stackingNode.get(); }