DevTools: make extension server a part of core, panels' code should depend on it.

Source/devtools/front_end/audits/AuditsPanel.js

Index: Source/devtools/front_end/audits/AuditsPanel.js
diff --git a/Source/devtools/front_end/audits/AuditsPanel.js b/Source/devtools/front_end/audits/AuditsPanel.js
index f6b32a8a9195f4179b849075dc7ba9e293e5534f..c952a15f43a8ebed441de48690e26904b879ece7 100644
--- a/Source/devtools/front_end/audits/AuditsPanel.js
+++ b/Source/devtools/front_end/audits/AuditsPanel.js
@@ -55,6 +55,13 @@ WebInspector.AuditsPanel = function()
     this._launcherView = new WebInspector.AuditLauncherView(this._auditController);
     for (var id in this.categoriesById)
         this._launcherView.addCategory(this.categoriesById[id]);
+
+    var extensionCategories = WebInspector.extensionServer.auditCategories();
+    for (var i = 0; i < extensionCategories.length; ++i) {
+        var category = extensionCategories[i];
+        this.addCategory(new WebInspector.AuditExtensionCategory(category.extensionOrigin, category.id, category.displayName, category.ruleCount));
+    }
+    WebInspector.extensionServer.addEventListener(WebInspector.ExtensionServer.Events.AuditCategoryAdded, this._extensionAuditCategoryAdded, this);
 }
 
 WebInspector.AuditsPanel.prototype = {
@@ -168,6 +175,15 @@ WebInspector.AuditsPanel.prototype = {
         this.auditResultsTreeElement.removeChildren();
     },
 
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _extensionAuditCategoryAdded: function(event)
+    {
+        var category = /** @type {!WebInspector.ExtensionAuditCategory} */ (event.data);
+        this.addCategory(new WebInspector.AuditExtensionCategory(category.extensionOrigin, category.id, category.displayName, category.ruleCount));
+    },
+
     __proto__: WebInspector.PanelWithSidebarTree.prototype
 }