Minimal feature collector for select selectors.

Source/core/dom/shadow/SelectRuleFeatureSet.h

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
 #include "core/css/RuleFeature.h"
 #include "core/dom/Element.h"
 
 namespace blink {
 
 class SpaceSplitString;
 
 class SelectRuleFeatureSet : public RuleFeatureSet {
     DISALLOW_ALLOCATION();
 public:
+    void collectFeaturesFromSelector(const CSSSelector&);
     bool checkSelectorsForClassChange(const SpaceSplitString& changedClasses) const;
     bool checkSelectorsForClassChange(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses) const;
 };
 
 }
 
 #endif