Recalc sibling styles for forward positional rules on mutations only.

Source/core/dom/SiblingRuleHelper.h

 // Copyright (c) 2014 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.
 
 #ifndef SiblingRuleHelper_h
 #define SiblingRuleHelper_h
 
 #include "core/dom/Node.h"
 
 namespace WebCore {
 
 class SiblingRuleHelper {
 public:
     SiblingRuleHelper(Node* node) : m_node(node)
     {
         ASSERT(node);
         ASSERT(node->isElementNode() || node->isShadowRoot());
     }
 
     void checkForChildrenAdjacentRuleChanges();
 
     void setChildrenAffectedByDirectAdjacentRules();
+    void setChildrenAffectedByIndirectAdjacentRules();
     void setChildrenAffectedByForwardPositionalRules();
     void setChildrenAffectedByBackwardPositionalRules();
     void setChildrenAffectedByFirstChildRules();
     void setChildrenAffectedByLastChildRules();
 
     bool isFinishedParsingChildren();
 
     bool childrenSupportStyleSharing();
 
 private:
     bool childrenAffectedByPositionalRules() const;
     bool childrenAffectedByFirstChildRules() const;
     bool childrenAffectedByLastChildRules() const;
     bool childrenAffectedByDirectAdjacentRules() const;
+    bool childrenAffectedByIndirectAdjacentRules() const;
     bool childrenAffectedByForwardPositionalRules() const;
     bool childrenAffectedByBackwardPositionalRules() const;
 
     Node* m_node;
 };
 
 } // namespace
 
 #endif