Backend for css rule tracking

third_party/WebKit/Source/core/css/resolver/StyleResolver.h

Index: third_party/WebKit/Source/core/css/resolver/StyleResolver.h
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleResolver.h b/third_party/WebKit/Source/core/css/resolver/StyleResolver.h
index 929d3746dc01eb1304b872bf53906bab8ba01b26..a02ed83d078605902cca0adfefa4378f41e55951 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleResolver.h
+++ b/third_party/WebKit/Source/core/css/resolver/StyleResolver.h
@@ -34,6 +34,7 @@
 #include "core/css/resolver/CSSPropertyPriority.h"
 #include "core/css/resolver/MatchedPropertiesCache.h"
 #include "core/css/resolver/StyleBuilder.h"
+#include "core/css/resolver/StyleRuleUsageTracker.h"
 #include "core/style/CachedUAStyle.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Deque.h"
@@ -194,6 +195,8 @@ class CORE_EXPORT StyleResolver final
 
   void initWatchedSelectorRules();
 
+  void setRuleUsageTracker(StyleRuleUsageTracker*);
+
  private:
   explicit StyleResolver(Document&);
 
@@ -202,6 +205,8 @@ class CORE_EXPORT StyleResolver final
   // FIXME: This should probably go away, folded into FontBuilder.
   void updateFont(StyleResolverState&);
 
+  void addMatchedRulesToTracker(const ElementRuleCollector&);
+
   void loadPendingResources(StyleResolverState&);
   void adjustComputedStyle(StyleResolverState&, Element*);
 
@@ -285,6 +290,8 @@ class CORE_EXPORT StyleResolver final
   Member<RuleSet> m_uncommonAttributeRuleSet;
   Member<RuleSet> m_watchedSelectorsRules;
 
+  Member<StyleRuleUsageTracker> m_tracker;
+
   bool m_needCollectFeatures;
   bool m_printMediaType;
   bool m_hasFullscreenUAStyle = false;