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

Source/devtools/front_end/extensions/ExtensionPanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 127 matching lines @@
             this.element.title = tooltip;
         if (typeof disabled === "boolean")
             this.element.disabled = disabled;
     }
 }
 
 /**
  * @constructor
  * @extends {WebInspector.SidebarPane}
  * @param {!WebInspector.ExtensionServer} server
+ * @param {string} panelName
  * @param {string} title
  * @param {string} id
  */
-WebInspector.ExtensionSidebarPane = function(server, title, id)
+WebInspector.ExtensionSidebarPane = function(server, panelName, title, id)
 {
     WebInspector.SidebarPane.call(this, title);
     this.setHideOnDetach();
+    this._panelName = panelName;
     this._server = server;
     this._id = id;
 }
 
 WebInspector.ExtensionSidebarPane.prototype = {
     /**
+     * @return {string}
+     */
+    id: function()
+    {
+        return this._id;
+    },
+
+    /**
+     * @return {string}
+     */
+    panelName: function()
+    {
+        return this._panelName;
+    },
+
+    /**
      * @param {!Object} object
      * @param {string} title
      * @param {function(?string=)} callback
      */
     setObject: function(object, title, callback)
     {
         this._createObjectPropertiesView();
         this._setObject(WebInspector.RemoteObject.fromLocalObject(object), title, callback);
     },
 
@@ skipping 81 matching lines @@
         if (!title)
             section.headerElement.classList.add("hidden");
         section.expanded = true;
         section.editable = false;
         this._objectPropertiesView.element.appendChild(section.element);
         callback();
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }