Introduce localCaretRectOf() for VisiblePosition

Source/core/editing/VisiblePosition.cpp

Index: Source/core/editing/VisiblePosition.cpp
diff --git a/Source/core/editing/VisiblePosition.cpp b/Source/core/editing/VisiblePosition.cpp
index 48bc675d39487d8d2abcf5ba6bc56e99530dcf27..5b66a19eaa2264c5c3db2c2a977fed5352df144a 100644
--- a/Source/core/editing/VisiblePosition.cpp
+++ b/Source/core/editing/VisiblePosition.cpp
@@ -687,16 +687,17 @@ UChar32 characterBefore(const VisiblePosition& visiblePosition)
     return characterAfter(previousPositionOf(visiblePosition));
 }
 
-LayoutRect VisiblePosition::localCaretRect(LayoutObject*& layoutObject) const
+// TODO(yosin) We should move |localCaretRect()| to "VisibleUnits.cpp".
+static LayoutRect localCaretRectOf(const VisiblePosition& visiblePosition, LayoutObject*& layoutObject)
 {
-    PositionWithAffinity positionWithAffinity(m_deepPosition, m_affinity);
+    PositionWithAffinity positionWithAffinity(visiblePosition.deepEquivalent(), visiblePosition.affinity());
     return localCaretRectOfPosition(positionWithAffinity, layoutObject);
 }
 
 IntRect absoluteCaretBoundsOf(const VisiblePosition& visiblePosition)
 {
     LayoutObject* layoutObject;
-    LayoutRect localRect = visiblePosition.localCaretRect(layoutObject);
+    LayoutRect localRect = localCaretRectOf(visiblePosition, layoutObject);
     if (localRect.isEmpty() || !layoutObject)
         return IntRect();
 
@@ -712,7 +713,7 @@ int lineDirectionPointForBlockDirectionNavigationOf(const VisiblePosition& visib
         return 0;
 
     LayoutObject* layoutObject;
-    LayoutRect localRect = visiblePosition.localCaretRect(layoutObject);
+    LayoutRect localRect = localCaretRectOf(visiblePosition, layoutObject);
     if (localRect.isEmpty() || !layoutObject)
         return 0;