Implement closed shadow adjustment for Element.offsetParent

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h

Index: third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h
index 99d044640dc687757763772648f91944d761ab50..bc0673d3d15312a01ae10aeac9c6471bf10ff812 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h
@@ -148,15 +148,15 @@ public:
 
     // IE extensions. Used to calculate offsetWidth/Height.  Overridden by inlines (LayoutFlow)
     // to return the remaining width on a given line (and the height of a single line).
-    virtual LayoutUnit offsetLeft() const;
-    virtual LayoutUnit offsetTop() const;
+    virtual LayoutUnit offsetLeft(const Element*) const;
+    virtual LayoutUnit offsetTop(const Element*) const;
     virtual LayoutUnit offsetWidth() const = 0;
     virtual LayoutUnit offsetHeight() const = 0;
 
-    int pixelSnappedOffsetLeft() const { return roundToInt(offsetLeft()); }
-    int pixelSnappedOffsetTop() const { return roundToInt(offsetTop()); }
-    virtual int pixelSnappedOffsetWidth() const;
-    virtual int pixelSnappedOffsetHeight() const;
+    int pixelSnappedOffsetLeft(const Element* parent) const { return roundToInt(offsetLeft(parent)); }
+    int pixelSnappedOffsetTop(const Element* parent) const { return roundToInt(offsetTop(parent)); }
+    virtual int pixelSnappedOffsetWidth(const Element*) const;
+    virtual int pixelSnappedOffsetHeight(const Element*) const;
 
     bool hasSelfPaintingLayer() const;
     PaintLayer* layer() const { return m_layer.get(); }
@@ -304,7 +304,7 @@ public:
 protected:
     void willBeDestroyed() override;
 
-    LayoutPoint adjustedPositionRelativeToOffsetParent(const LayoutPoint&) const;
+    LayoutPoint adjustedPositionRelativeTo(const LayoutPoint&, const Element*) const;
 
     bool calculateHasBoxDecorations() const;