Backend for css rule tracking

third_party/WebKit/Source/core/inspector/InspectorCSSAgent.h

Index: third_party/WebKit/Source/core/inspector/InspectorCSSAgent.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.h b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.h
index 2a8f4031c13a932bd6854d557263817e802cc817..b18a9750b6a228c960bb664e8998d51bc0e8e550 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.h
+++ b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.h
@@ -57,6 +57,7 @@ class InspectorResourceContentLoader;
 class MediaList;
 class Node;
 class LayoutObject;
+class StyleRuleUsageTracker;
 
 class CORE_EXPORT InspectorCSSAgent final
     : public InspectorBaseAgent<protocol::CSS::Metainfo>,
@@ -124,6 +125,9 @@ class CORE_EXPORT InspectorCSSAgent final
   void activeStyleSheetsUpdated(Document*);
   void documentDetached(Document*);
   void fontsUpdated();
+  void getUnusedRules(
+      std::unique_ptr<protocol::Array<protocol::CSS::RuleUsage>>*);
+  void setUsageTrackerStatus(bool enable);
 
   void enable(std::unique_ptr<EnableCallback>) override;
   void disable(ErrorString*) override;
@@ -208,6 +212,13 @@ class CORE_EXPORT InspectorCSSAgent final
       int nodeId,
       Maybe<protocol::Array<String>>* backgroundColors) override;
 
+  void startRuleUsageTracking(ErrorString*) override;
+
+  void stopRuleUsageTracking(
+      ErrorString*,
+      std::unique_ptr<protocol::Array<protocol::CSS::RuleUsage>>* result)
+      override;
+
   void collectMediaQueriesFromRule(CSSRule*,
                                    protocol::Array<protocol::CSS::CSSMedia>*);
   void collectMediaQueriesFromStyleSheet(
@@ -303,12 +314,15 @@ class CORE_EXPORT InspectorCSSAgent final
   String detectOrigin(CSSStyleSheet* pageStyleSheet, Document* ownerDocument);
 
   std::unique_ptr<protocol::CSS::CSSRule> buildObjectForRule(CSSStyleRule*);
+  std::unique_ptr<protocol::CSS::RuleUsage> buildObjectForRuleUsage(CSSRule*,
+                                                                    bool);
   std::unique_ptr<protocol::Array<protocol::CSS::RuleMatch>>
   buildArrayForMatchedRuleList(CSSRuleList*, Element*, PseudoId);
   std::unique_ptr<protocol::CSS::CSSStyle> buildObjectForAttributesStyle(
       Element*);
 
   // InspectorDOMAgent::DOMListener implementation
+  void didAddDocument(Document*) override;
   void didRemoveDocument(Document*) override;
   void didRemoveDOMNode(Node*) override;
   void didModifyDOMAttr(Element*) override;
@@ -358,6 +372,8 @@ class CORE_EXPORT InspectorCSSAgent final
   NodeToInspectorStyleSheet m_nodeToInspectorStyleSheet;
   NodeIdToForcedPseudoState m_nodeIdToForcedPseudoState;
 
+  Member<StyleRuleUsageTracker> m_tracker;
+
   Member<CSSStyleSheet> m_inspectorUserAgentStyleSheet;
 
   int m_resourceContentLoaderClientId;