Use localToContainerPoint when checking mapToContainer result

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index edcb1c94870370845552b44c62254c97e361c6cd..e2834ffc0461f4dbd2c308380161fbf3ae8bad7b 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -2323,8 +2323,13 @@ LayoutRect RenderObject::viewRect() const
 
 FloatPoint RenderObject::localToAbsolute(const FloatPoint& localPoint, MapCoordinatesFlags mode) const
 {
+    return localToAbsolute(0, localPoint, mode);
+}
+
+FloatPoint RenderObject::localToAbsolute(const RenderLayerModelObject* repaintContainer, const FloatPoint& localPoint, MapCoordinatesFlags mode) const
+{
     TransformState transformState(TransformState::ApplyTransformDirection, localPoint);
-    mapLocalToContainer(0, transformState, mode | ApplyContainerFlip);
+    mapLocalToContainer(repaintContainer, transformState, mode | ApplyContainerFlip);

[leviw_travelin_and_unemployed, 2014/05/30 17:17:50]

I don't think you actually want this. mapLocalToAbsolute intentionally passes in
zero, which tells mapLocalToContainer to map it to the outermost container (and
hence, absolute). Passing a repaintContainer means you're actually implementing
localToContainer, not localToAbsolute.

     transformState.flatten();
 
     return transformState.lastPlanarPoint();