Introduce composed tree version of lastEditableVisiblePositionBeforePositionInRoot()

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 479 matching lines @@
 PositionInComposedTree firstEditablePositionAfterPositionInRoot(const PositionInComposedTree& position, Node* highestRoot)
 {
     return firstEditablePositionAfterPositionInRootAlgorithm<EditingInComposedTreeStrategy>(position, highestRoot);
 }
 
 VisiblePosition lastEditableVisiblePositionBeforePositionInRoot(const Position& position, ContainerNode* highestRoot)
 {
     return createVisiblePosition(lastEditablePositionBeforePositionInRoot(position, highestRoot));
 }
 
+VisiblePositionInComposedTree lastEditableVisiblePositionBeforePositionInRoot(const PositionInComposedTree& position, ContainerNode* highestRoot)
+{
+    return createVisiblePosition(lastEditablePositionBeforePositionInRoot(position, highestRoot));
+}
+
 template <typename Strategy>
 PositionAlgorithm<Strategy> lastEditablePositionBeforePositionInRootAlgorithm(const PositionAlgorithm<Strategy>& position, Node* highestRoot)
 {
     // When position falls after highestRoot, the result is easy to compute.
     if (position.compareTo(PositionAlgorithm<Strategy>::lastPositionInNode(highestRoot)) == 1)
         return PositionAlgorithm<Strategy>::lastPositionInNode(highestRoot);
 
     PositionAlgorithm<Strategy> editablePosition = position;
 
     if (position.anchorNode()->treeScope() != highestRoot->treeScope()) {
@@ skipping 1160 matching lines @@
     // if the selection starts just before a paragraph break, skip over it
     if (isEndOfParagraph(visiblePosition))
         return mostForwardCaretPosition(nextPositionOf(visiblePosition).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