Backend for css rule tracking

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
index 8bf16e95d718ed3ca0ff9c3f373314673acd2ff7..c8456a22fe7d5cdb577a2e29de191334110d51e4 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
@@ -580,6 +580,35 @@ WebInspector.CSSModel.prototype = {
     },
 
     /**
+     * @param {boolean} enable
+     */
+    startSelectorRecording: function(enable)
+    {
+        this._agent.setSelectorRecording(enable);
+    },
+
+    /**
+     * @return {!Promise<?Array<?WebInspector.CSSStyleRule>>}
+     */
+    ruleListPromise: function()
+    {
+        /**
+        * @param {?string} error
+        * @param {!Array<!CSSAgent.CSSRule>=} usedCSSRules
+        * @this {WebInspector.CSSModel}
+        * @return {?Array<?WebInspector.CSSStyleRule>}
+        */
+        function usedRulesCallback(error, usedCSSRules)
+        {
+            if (error || !usedCSSRules)
+                return null;
+
+            return usedCSSRules.map(rule => new WebInspector.CSSStyleRule(this, rule, rule.status));
+        }
+        return this._agent.getRuleList(usedRulesCallback.bind(this));
+    },
+
+    /**
      * @param {number} nodeId
      * @return {!Promise.<?Array.<!CSSAgent.PlatformFontUsage>>}
      */