Fix LinkHighlight to position correctly w.r.t. squashed layers.

Source/web/LinkHighlight.h

Index: Source/web/LinkHighlight.h
diff --git a/Source/web/LinkHighlight.h b/Source/web/LinkHighlight.h
index 6a05272306e16ead72c22fe886db4247fe157c6d..6fbd3de42d200547f76861e2ab37980912219e65 100644
--- a/Source/web/LinkHighlight.h
+++ b/Source/web/LinkHighlight.h
@@ -41,7 +41,7 @@ namespace blink {
 
 class DisplayList;
 class Node;
-class RenderLayer;
+class RenderLayerModelObject;
 struct WebRect;
 class WebViewImpl;
 
@@ -75,11 +75,11 @@ private:
     void releaseResources();
     void computeQuads(const Node&, WTF::Vector<FloatQuad>&) const;
 
-    RenderLayer* computeEnclosingCompositingLayer();
+    void attachLinkHighlightToCompositingLayer(const RenderLayerModelObject* paintInvalidationContainer);
     void clearGraphicsLayerLinkHighlightPointer();
     // This function computes the highlight path, and returns true if it has changed
     // size since the last call to this function.
-    bool computeHighlightLayerPathAndPosition(RenderLayer*);
+    bool computeHighlightLayerPathAndPosition(const RenderLayerModelObject*);
 
     OwnPtr<WebContentLayer> m_contentLayer;
     OwnPtr<WebLayer> m_clipLayer;