Backend for css rule tracking

third_party/WebKit/Source/devtools/front_end/sdk/CSSRule.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/CSSRule.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/CSSRule.js b/third_party/WebKit/Source/devtools/front_end/sdk/CSSRule.js
index a80ebf1cfa1d893dc0eb94f3f951c66441a9e4a7..4b08212703d8ef5f3178e2b20bab5c468c9687bc 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/CSSRule.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/CSSRule.js
@@ -100,12 +100,14 @@ WebInspector.CSSStyleRule = class extends WebInspector.CSSRule {
   /**
    * @param {!WebInspector.CSSModel} cssModel
    * @param {!Protocol.CSS.CSSRule} payload
+   * @param {boolean=} wasUsed
    */
-  constructor(cssModel, payload) {
+  constructor(cssModel, payload, wasUsed) {
     super(cssModel, payload);
 
     this._reinitializeSelectors(payload.selectorList);
     this.media = payload.media ? WebInspector.CSSMedia.parseMediaArrayPayload(cssModel, payload.media) : [];
+    this.wasUsed = wasUsed || false;
   }
 
   /**