Introduce composed tree version of VisiblePosition

Source/core/editing/serializers/StyledMarkupSerializer.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Igalia S.L.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 157 matching lines @@
 }
 
 template<typename Strategy>
 String StyledMarkupSerializer<Strategy>::createMarkup()
 {
     StyledMarkupAccumulator markupAccumulator(m_shouldResolveURLs, toTextOffset(m_start.parentAnchoredEquivalent()), toTextOffset(m_end.parentAnchoredEquivalent()), m_start.document(), m_shouldAnnotate, m_convertBlocksToInlines);
 
     Node* pastEnd = m_end.nodeAsRangePastLastNode();
 
     Node* firstNode = m_start.nodeAsRangeFirstNode();
-    VisiblePosition visibleStart = createVisiblePosition(m_start);
-    VisiblePosition visibleEnd = createVisiblePosition(m_end);
+    VisiblePosition visibleStart = createVisiblePositionInDOMTree(m_start);
+    VisiblePosition visibleEnd = createVisiblePositionInDOMTree(m_end);
     if (shouldAnnotate() && needInterchangeNewlineAfter(visibleStart)) {
         markupAccumulator.appendInterchangeNewline();
         if (visibleStart.deepEquivalent() == previousPositionOf(visibleEnd).deepEquivalent())
             return markupAccumulator.takeResults();
 
         firstNode = nextPositionOf(visibleStart).deepEquivalent().anchorNode();
 
         if (pastEnd && PositionAlgorithm<Strategy>::beforeNode(firstNode).compareTo(PositionAlgorithm<Strategy>::beforeNode(pastEnd)) >= 0) {
             // This condition hits in editing/pasteboard/copy-display-none.html.
             return markupAccumulator.takeResults();
@@ skipping 285 matching lines @@
     if (element.isHTMLElement() && shouldAnnotate())
         inlineStyle->mergeStyleFromRulesForSerialization(&toHTMLElement(element));
 
     return inlineStyle;
 }
 
 template class StyledMarkupSerializer<EditingStrategy>;
 template class StyledMarkupSerializer<EditingInComposedTreeStrategy>;
 
 } // namespace blink