Move rootUserSelectAllForNode() to EditingStrategy template class from PositionAlgorithm template cl

Source/core/editing/EditingStrategy.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/editing/EditingStrategy.h"
 
 #include "core/editing/EditingUtilities.h"
 #include "core/layout/LayoutObject.h"
 
@@ skipping 49 matching lines @@
     if (!editingIgnoresContent(node))
         return 0;
 
     // editingIgnoresContent uses the same logic in
     // isEmptyNonEditableNodeInEditable (EditingUtilities.cpp). We don't
     // understand why this function returns 1 even when the node doesn't have
     // children.
     return 1;
 }
 
+template <typename Strategy>
+Node* EditingAlgorithm<Strategy>::rootUserSelectAllForNode(Node* node)
+{
+    if (!node || !nodeIsUserSelectAll(node))
+        return nullptr;
+    Node* parent = Strategy::parent(*node);
+    if (!parent)
+        return node;
+
+    Node* candidateRoot = node;
+    while (parent) {
+        if (!parent->layoutObject()) {
+            parent = Strategy::parent(*parent);
+            continue;
+        }
+        if (!nodeIsUserSelectAll(parent))
+            break;
+        candidateRoot = parent;
+        parent = Strategy::parent(*candidateRoot);
+    }
+    return candidateRoot;
+}
+
 template class CORE_TEMPLATE_EXPORT EditingAlgorithm<NodeTraversal>;
 template class CORE_TEMPLATE_EXPORT EditingAlgorithm<ComposedTreeTraversal>;
 
 } // namespace blink