Implement closed shadow adjustment for Element.offsetParent

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

Index: third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
index cb416dca18088a6b66608b98352cce926530b206..3f459c14262251ba6a689d83f6d68748b2e3007c 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
@@ -771,7 +771,7 @@ LayoutPoint LayoutBoxModelObject::adjustedPositionRelativeToOffsetParent(const L
     // If the offsetParent of the element is null, or is the HTML body element,
     // return the distance between the canvas origin and the left border edge
     // of the element and stop this algorithm.

[eae, 2016/06/09 13:19:42]

Please update this comment to explain what an offsetParentForBidning is and how
it differs from the regular offsetParent call.

[kochi, 2016/06/09 16:04:27]

I'm not sure "or is the HTML body element" part, as it does not match the code
already.  Removed the part and updated.

Now I renamed this function to ...RelativeTo"Unclosed"OffsetParent(),
so that it matches what it compares to.

-    Element* element = offsetParent();
+    Element* element = offsetParentForBinding();
     if (!element)
         return referencePoint;