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..1e9eb2213e1eedd1a04a50e78b7d6cf89d65888c 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
@@ -80,6 +80,9 @@ WebInspector.CSSModel.MediaTypes = ["all", "braille", "embossed", "handheld", "p
 
 WebInspector.CSSModel.PseudoStateMarker = "pseudo-state-marker";
 
+/** @typedef {!{range: !WebInspector.TextRange, styleSheetId: !CSSAgent.StyleSheetId, wasUsed: boolean}} */
+WebInspector.CSSModel.RuleTextRange;
+
 /**
  * @constructor
  * @param {!CSSAgent.StyleSheetId} styleSheetId
@@ -580,6 +583,34 @@ WebInspector.CSSModel.prototype = {
     },
 
     /**
+     * @param {boolean} enable
+     */
+    startSelectorRecording: function(enable)
+    {
+        this._agent.setSelectorRecording(enable);
+    },
+
+    /**
+     * @return {!Promise<?Array<!WebInspector.CSSModel.RuleTextRange>>}
+     */
+    ruleListPromise: function()
+    {
+        /**
+        * @param {?string} error
+        * @param {!Array<!CSSAgent.RuleUsage>=} CSSRules
+        * @return {?Array<!WebInspector.CSSModel.RuleTextRange>}}
+        */
+        function usedRulesCallback(error, CSSRules)
+        {
+            if (error || !CSSRules)
+                return null;
+
+            return CSSRules.map(rule => ({range: rule.range, styleSheetId: rule.styleSheetId, wasUsed: rule.status}));
+        }
+        return this._agent.getRuleList(usedRulesCallback);
+    },
+
+    /**
      * @param {number} nodeId
      * @return {!Promise.<?Array.<!CSSAgent.PlatformFontUsage>>}
      */