Handle ::content and :host-context correctly in SelectorQuery.

Source/core/dom/SelectorQuery.h

 /*
  * Copyright (C) 2011, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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.
@@ skipping 62 matching lines @@
     bool selectorListMatches(ContainerNode& rootNode, Element&, typename SelectorQueryTrait::OutputType&) const;
     template <typename SelectorQueryTrait>
     void executeSlow(ContainerNode& rootNode, typename SelectorQueryTrait::OutputType&) const;
     template <typename SelectorQueryTrait>
     void executeSlowTraversingShadowTree(ContainerNode& rootNode, typename SelectorQueryTrait::OutputType&) const;
     template <typename SelectorQueryTrait>
     void execute(ContainerNode& rootNode, typename SelectorQueryTrait::OutputType&) const;
     const CSSSelector* selectorForIdLookup(const CSSSelector&) const;
 
     Vector<const CSSSelector*> m_selectors;
-    bool m_crossesTreeBoundary;
+    bool m_crossesTreeBoundary : 1;
+    bool m_needsUpdatedDistribution : 1;
 };
 
 class SelectorQuery {
     WTF_MAKE_NONCOPYABLE(SelectorQuery);
     WTF_MAKE_FAST_ALLOCATED(SelectorQuery);
 public:
     static PassOwnPtr<SelectorQuery> adopt(CSSSelectorList&);
 
     bool matches(Element&) const;
     Element* closest(Element&) const;
@@ skipping 12 matching lines @@
     SelectorQuery* add(const AtomicString&, const Document&, ExceptionState&);
     void invalidate();
 
 private:
     HashMap<AtomicString, OwnPtr<SelectorQuery>> m_entries;
 };
 
 }
 
 #endif