Backend for css rule tracking

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 WebInspector.CSSValue = class {
   /**
    * @param {!Protocol.CSS.Value} payload
    */
@@ skipping 82 matching lines @@
   }
 };
 
 /**
  * @unrestricted
  */
 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;
   }
 
   /**
    * @param {!WebInspector.CSSModel} cssModel
    * @param {string} selectorText
    * @return {!WebInspector.CSSStyleRule}
    */
   static createDummyRule(cssModel, selectorText) {
     var dummyPayload = {
       selectorList: {
@@ skipping 172 matching lines @@
   setKeyText(newKeyText) {
     var styleSheetId = this.styleSheetId;
     if (!styleSheetId)
       throw 'No rule stylesheet id';
     var range = this._keyText.range;
     if (!range)
       throw 'Keyframe key is not editable';
     return this._cssModel.setKeyframeKey(styleSheetId, range, newKeyText);
   }
 };