Implement closed shadow adjustment for Element.offsetParent

third_party/WebKit/Source/core/dom/Element.cpp

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index ebaa903a39c876845428c9f71fc889bc35ced02e..dfb370b074bee4421e726b2fc1b5ef6cee70ef46 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -607,7 +607,7 @@ int Element::offsetLeft()
 {
     document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
     if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
-        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetLeft()), layoutObject->styleRef()).round();
+        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetLeft(offsetParent())), layoutObject->styleRef()).round();
     return 0;
 }
 
@@ -615,7 +615,7 @@ int Element::offsetTop()
 {
     document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
     if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
-        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetTop()), layoutObject->styleRef()).round();
+        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetTop(offsetParent())), layoutObject->styleRef()).round();
     return 0;
 }
 
@@ -623,7 +623,7 @@ int Element::offsetWidth()
 {
     document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
     if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
-        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetWidth()), layoutObject->styleRef()).round();
+        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetWidth(offsetParent())), layoutObject->styleRef()).round();
     return 0;
 }
 
@@ -631,7 +631,7 @@ int Element::offsetHeight()
 {
     document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
     if (LayoutBoxModelObject* layoutObject = layoutBoxModelObject())
-        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetHeight()), layoutObject->styleRef()).round();
+        return adjustLayoutUnitForAbsoluteZoom(LayoutUnit(layoutObject->pixelSnappedOffsetHeight(offsetParent())), layoutObject->styleRef()).round();
     return 0;
 }
 
@@ -640,17 +640,7 @@ Element* Element::offsetParent()
     document().updateStyleAndLayoutIgnorePendingStylesheetsForNode(this);
 
     LayoutObject* layoutObject = this->layoutObject();
-    if (!layoutObject)
-        return nullptr;
-
-    Element* element = layoutObject->offsetParent();
-    if (!element)
-        return nullptr;
-
-    if (element->isInShadowTree() && !element->containingShadowRoot()->isOpenOrV0())
-        return nullptr;
-
-    return element;
+    return layoutObject ? layoutObject->unclosedOffsetParent() : nullptr;
 }
 
 int Element::clientLeft()