Introduce Position version of enclsoingBlock()

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 632 matching lines @@
 bool isEnclosingBlock(const Node* node)
 {
     return node && node->layoutObject() && !node->layoutObject()->isInline() && !node->layoutObject()->isRubyText();
 }
 
 bool isInline(const Node* node)
 {
     return node && node->layoutObject() && node->layoutObject()->isInline();
 }
 
-// FIXME: Deploy this in all of the places where enclosingBlockFlow/enclosingBlockFlowOrTableElement are used.
-// FIXME: Pass a position to this function. 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.
+// TODO(yosin) Deploy this in all of the places where |enclosingBlockFlow()| and
+// |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)
 {
-    Node* enclosingNode = enclosingNodeOfType(firstPositionInOrBeforeNode(node), isEnclosingBlock, rule);
+    return enclosingBlock(firstPositionInOrBeforeNode(node), rule);
+}
+
+Element* enclosingBlock(const Position& position, EditingBoundaryCrossingRule rule)
+{
+    Node* enclosingNode = enclosingNodeOfType(position, isEnclosingBlock, rule);
     return enclosingNode && enclosingNode->isElementNode() ? toElement(enclosingNode) : nullptr;
 }
 
 Element* enclosingBlockFlowElement(Node& node)
 {
     if (isBlockFlowElement(node))
         return &toElement(node);
 
     for (Node* n = node.parentNode(); n; n = n->parentNode()) {
         if (isBlockFlowElement(*n) || isHTMLBodyElement(*n))
@@ skipping 921 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