Setup parent stylesheet for tree boundary crossing rules.

Source/core/css/TreeBoundaryCrossingRules.h

Index: Source/core/css/TreeBoundaryCrossingRules.h
diff --git a/Source/core/css/TreeBoundaryCrossingRules.h b/Source/core/css/TreeBoundaryCrossingRules.h
index 9e391e228ffb98ab9677f85f0f6bdb591033258f..2cbabeb3e5a7289033734902345bad1967f07039 100644
--- a/Source/core/css/TreeBoundaryCrossingRules.h
+++ b/Source/core/css/TreeBoundaryCrossingRules.h
@@ -37,7 +37,9 @@ class RuleFeatureSet;
 
 class TreeBoundaryCrossingRules {
 public:
-    void addRule(StyleRule*, size_t selectorIndex, ContainerNode* scopingNode, AddRuleFlags);
+    typedef HashMap<const CSSStyleSheet*, OwnPtrWillBeMember<RuleSet> > CSSStyleSheetRuleSubSet;
+
+    void addRule(StyleRule*, size_t selectorIndex, ContainerNode* scopingNode, CSSStyleSheet* parentStyleSheet, AddRuleFlags);
     void clear() { m_treeBoundaryCrossingRuleSetMap.clear(); }
     void reset(const ContainerNode* scopingNode);
     bool isEmpty() const { return m_treeBoundaryCrossingRuleSetMap.isEmpty(); }
@@ -46,11 +48,11 @@ public:
     DocumentOrderedList::iterator begin() { return m_scopingNodes.begin(); }
     DocumentOrderedList::iterator end() { return m_scopingNodes.end(); }
     size_t size() const { return m_scopingNodes.size(); }
-    RuleSet* ruleSetScopedBy(const ContainerNode* scopingNode) { return m_treeBoundaryCrossingRuleSetMap.get(scopingNode); }
+    CSSStyleSheetRuleSubSet* ruleSetScopedBy(const ContainerNode* scopingNode) { return m_treeBoundaryCrossingRuleSetMap.get(scopingNode); }
 
 private:
     DocumentOrderedList m_scopingNodes;
-    typedef WillBePersistentHeapHashMap<const ContainerNode*, OwnPtrWillBeMember<RuleSet> > TreeBoundaryCrossingRuleSetMap;
+    typedef WillBePersistentHeapHashMap<const ContainerNode*, OwnPtrWillBeMember<CSSStyleSheetRuleSubSet> > TreeBoundaryCrossingRuleSetMap;
     TreeBoundaryCrossingRuleSetMap m_treeBoundaryCrossingRuleSetMap;
 };