Make makeSearchRange() in VisibleSelection to handle BeforeAnchor and AfterAnchor position type

third_party/WebKit/Source/core/editing/VisibleSelection.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 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 164 matching lines @@
   // On a treasure map, <b>X</b> marks the spot.
   //                       ^ selected
   //
   DCHECK(isRange());
   return normalizeRange(EphemeralRangeTemplate<Strategy>(m_start, m_end));
 }
 
 template <typename Strategy>
 static EphemeralRangeTemplate<Strategy> makeSearchRange(
     const PositionTemplate<Strategy>& pos) {
-  Node* node = pos.anchorNode();
+  Node* node = pos.computeContainerNode();
   if (!node)
     return EphemeralRangeTemplate<Strategy>();
   Document& document = node->document();
   if (!document.documentElement())
     return EphemeralRangeTemplate<Strategy>();
   Element* boundary = enclosingBlockFlowElement(*node);
   if (!boundary)
     return EphemeralRangeTemplate<Strategy>();
 
   return EphemeralRangeTemplate<Strategy>(
@@ skipping 604 matching lines @@
 
 void showTree(const blink::VisibleSelectionInFlatTree& sel) {
   sel.showTreeForThis();
 }
 
 void showTree(const blink::VisibleSelectionInFlatTree* sel) {
   if (sel)
     sel->showTreeForThis();
 }
 #endif