Introduce PositionInComposedTree version of enclosingBlock()

Source/core/editing/EditingUtilities.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Apple 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 643 matching lines @@
 // |enclosingBlockFlowOrTableElement()| are used.
 // TODO(yosin) Callers of |Node| version of |enclosingBlock()| should use
 // |Position| version The enclosing block of [table, x] for example, should be
 // the block that contains the table and not the table, and this function should
 // be the only one responsible for knowing about these kinds of special cases.
 Element* enclosingBlock(Node* node, EditingBoundaryCrossingRule rule)
 {
     return enclosingBlock(firstPositionInOrBeforeNode(node), rule);
 }
 
-Element* enclosingBlock(const Position& position, EditingBoundaryCrossingRule rule)
+template <typename Strategy>
+Element* enclosingBlockAlgorithm(const PositionAlgorithm<Strategy>& position, EditingBoundaryCrossingRule rule)
 {
     Node* enclosingNode = enclosingNodeOfType(position, isEnclosingBlock, rule);
     return enclosingNode && enclosingNode->isElementNode() ? toElement(enclosingNode) : nullptr;
 }
 
+Element* enclosingBlock(const Position& position, EditingBoundaryCrossingRule rule)
+{
+    return enclosingBlockAlgorithm<EditingStrategy>(position, rule);
+}
+
+Element* enclosingBlock(const PositionInComposedTree& position, EditingBoundaryCrossingRule rule)
+{
+    return enclosingBlockAlgorithm<EditingInComposedTreeStrategy>(position, rule);
+}
+
 Element* enclosingBlockFlowElement(Node& node)
 {
     if (isBlockFlowElement(node))
         return &toElement(node);
 
     for (Node* n = node.parentNode(); n; n = n->parentNode()) {
         if (isBlockFlowElement(*n) || isHTMLBodyElement(*n))
             return toElement(n);
     }
     return 0;
@@ skipping 918 matching lines @@
     // if the selection starts just before a paragraph break, skip over it
     if (isEndOfParagraph(visiblePosition))
         return mostForwardCaretPosition(visiblePosition.next().deepEquivalent());
 
     // otherwise, make sure to be at the start of the first selected node,
     // instead of possibly at the end of the last node before the selection
     return mostForwardCaretPosition(visiblePosition.deepEquivalent());
 }
 
 } // namespace blink