Have StyledMarkupSerializer work on the Composed tree

Source/core/editing/VisibleSelection.h

 /*
  * Copyright (C) 2004 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 102 matching lines @@
 
     bool intersectsNode(Node*) const;
 
     // FIXME: Most callers probably don't want these functions, but
     // are using them for historical reasons. toNormalizedRange and
     // toNormalizedPositions contracts the range around text, and
     // moves the caret upstream before returning the range/positions.
     PassRefPtrWillBeRawPtr<Range> toNormalizedRange() const;
     bool toNormalizedPositions(Position& start, Position& end) const;
     static void normalizePositions(const Position& start, const Position& end, Position* normalizedStart, Position* normalizedEnd);
+    static void normalizePositions(const PositionInComposedTree& start, const PositionInComposedTree& end, PositionInComposedTree* outStart, PositionInComposedTree* outEnd);
 
     Element* rootEditableElement() const;
     bool isContentEditable() const;
     bool hasEditableStyle() const;
     bool isContentRichlyEditable() const;
     // Returns a shadow tree node for legacy shadow trees, a child of the
     // ShadowRoot node for new shadow trees, or 0 for non-shadow trees.
     Node* nonBoundaryShadowTreeRootNode() const;
 
     VisiblePosition visiblePositionRespectingEditingBoundary(const LayoutPoint& localPoint, Node* targetNode) const;
@@ skipping 80 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::VisibleSelection&);
 void showTree(const blink::VisibleSelection*);
 #endif
 
 #endif // VisibleSelection_h