Add a WebDocument::watchCssSelectors(selectors)

Source/core/css/DocumentRuleSets.h

Index: Source/core/css/DocumentRuleSets.h
diff --git a/Source/core/css/DocumentRuleSets.h b/Source/core/css/DocumentRuleSets.h
index dd047eaab6568345ca31f1ce509771c62a99c6c3..44f787264ef5d3af9c3ff2c9faf2ada6bb86a77b 100644
--- a/Source/core/css/DocumentRuleSets.h
+++ b/Source/core/css/DocumentRuleSets.h
@@ -61,7 +61,7 @@ public:
     ~DocumentRuleSets();
     RuleSet* userStyle() const { return m_userStyle.get(); }
 
-    void initUserStyle(DocumentStyleSheetCollection*, const MediaQueryEvaluator&, StyleResolver&);
+    void initUserStyle(DocumentStyleSheetCollection*, const Vector<RefPtr<StyleRule> >& watchedSelectors, const MediaQueryEvaluator&, StyleResolver&);
     void resetAuthorStyle();
     void collectFeaturesTo(RuleFeatureSet&, bool isViewSource);
 
@@ -70,6 +70,7 @@ public:
 
 private:
     void collectRulesFromUserStyleSheets(const Vector<RefPtr<CSSStyleSheet> >&, RuleSet& userStyle, const MediaQueryEvaluator&, StyleResolver&);
+    void collectRulesFromWatchedSelectors(const Vector<RefPtr<StyleRule> >&, RuleSet& userStyle);
     OwnPtr<RuleSet> m_userStyle;
     ShadowDistributedRules m_shadowDistributedRules;
 };