Move absoluteCaretBoundsOf() for VisiblePosition to VisibleUnits.cpp

Source/core/editing/VisibleUnits.h

Index: Source/core/editing/VisibleUnits.h
diff --git a/Source/core/editing/VisibleUnits.h b/Source/core/editing/VisibleUnits.h
index 064085042967b3d69e8b3bfc57df1b385594412f..28343c14de5e301ff19f66a5dbc6be903cbf6ca5 100644
--- a/Source/core/editing/VisibleUnits.h
+++ b/Source/core/editing/VisibleUnits.h
@@ -88,6 +88,9 @@ CORE_EXPORT bool isVisuallyEquivalentCandidate(const PositionInComposedTree&);
 CORE_EXPORT Position canonicalPositionOf(const Position&);
 CORE_EXPORT PositionInComposedTree canonicalPositionOf(const PositionInComposedTree&);
 
+// Bounds of (possibly transformed) caret in absolute coords
+CORE_EXPORT IntRect absoluteCaretBoundsOf(const VisiblePosition&);
+
 UChar32 characterAfter(const VisiblePosition&);
 UChar32 characterBefore(const VisiblePosition&);