NetworkPanel: Make "sticky" behavior explicit.

Source/devtools/front_end/StatusBarButton.js

 /*
  * Copyright (C) 2009 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 479 matching lines @@
     /**
      * @return {number}
      */
     selectedIndex: function()
     {
         return this._selectElement.selectedIndex;
     },
 
     __proto__: WebInspector.StatusBarItem.prototype
 }
+
+/**
+ * @constructor
+ * @extends {WebInspector.StatusBarItem}
+ * @param {string} title
+ */
+WebInspector.StatusBarCheckbox = function(title)
+{
+    WebInspector.StatusBarItem.call(this, document.createElement("label"));
+    this.element.classList.add("status-bar-item", "checkbox");
+    this._checkbox = this.element.createChild("input");
+    this._checkbox.type = "checkbox";
+    this.element.createTextChild(title);
+}
+
+WebInspector.StatusBarCheckbox.prototype = {
+    /**
+     * @return {boolean}
+     */
+    checked: function()
+    {
+        return this._checkbox.checked;
+    },
+
+    __proto__: WebInspector.StatusBarItem.prototype
+}