Backend for css rule tracking

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

Index: third_party/WebKit/Source/core/inspector/InspectorStyleSheet.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorStyleSheet.h b/third_party/WebKit/Source/core/inspector/InspectorStyleSheet.h
index fe827309df31690f4be0232ff2b396061abc76eb..ea29b1fb6e4cec7256461a59388aac3b1541ac25 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorStyleSheet.h
+++ b/third_party/WebKit/Source/core/inspector/InspectorStyleSheet.h
@@ -173,6 +173,9 @@ class InspectorStyleSheet : public InspectorStyleSheetBase {
   buildObjectForStyleSheetInfo();
   std::unique_ptr<protocol::CSS::CSSRule> buildObjectForRuleWithoutMedia(
       CSSStyleRule*);
+  std::unique_ptr<protocol::CSS::RuleUsage> buildObjectForRuleUsage(CSSRule*,
+                                                                    String,
+                                                                    bool);
   std::unique_ptr<protocol::CSS::CSSKeyframeRule> buildObjectForKeyframeRule(
       CSSKeyframeRule*);
   std::unique_ptr<protocol::CSS::SelectorList> buildObjectForSelectorList(