Introduce positionForPoint() in LocalFrame class as replacement of visiblePositionForPoint()

Source/core/editing/VisibleSelection.h

Index: Source/core/editing/VisibleSelection.h
diff --git a/Source/core/editing/VisibleSelection.h b/Source/core/editing/VisibleSelection.h
index 517023a64911d64670d2cbc36ad3e53117950f69..90be5075493e03509bd5fed438668725835f6813 100644
--- a/Source/core/editing/VisibleSelection.h
+++ b/Source/core/editing/VisibleSelection.h
@@ -99,6 +99,7 @@ public:
 
     explicit VisibleSelection(const EphemeralRange&, TextAffinity = SEL_DEFAULT_AFFINITY, bool isDirectional = false);
 
+    explicit VisibleSelection(const PositionWithAffinity&, bool isDirectional = false);
     explicit VisibleSelection(const VisiblePosition&, bool isDirectional = false);
     VisibleSelection(const VisiblePosition&, const VisiblePosition&, bool isDirectional = false);