DevTools: bring back old landing page in timeline/performance.

third_party/WebKit/Source/devtools/front_end/ui/Toolbar.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 204 matching lines @@
   renderAsLinks() {
     this._contentElement.classList.add('toolbar-render-as-links');
   }
 
   /**
    * @param {boolean} enabled
    */
   setEnabled(enabled) {
     this._enabled = enabled;
     for (var item of this._items)
-      item._applyEnabledState();
+      item._applyEnabledState(this._enabled && item._enabled);
   }
 
   /**
    * @param {!UI.ToolbarItem} item
    */
   appendToolbarItem(item) {
     this._items.push(item);
     item._toolbar = this;
     if (!this._enabled)
-      item._applyEnabledState();
+      item._applyEnabledState(false);
     if (this._reverse)
       this._contentElement.insertBefore(item.element, this._insertionPoint.nextSibling);
     else
       this._contentElement.insertBefore(item.element, this._insertionPoint);
     this._hideSeparatorDupes();
   }
 
   appendSeparator() {
     this.appendToolbarItem(new UI.ToolbarSeparator());
   }
@@ skipping 122 matching lines @@
     super();
     this.element = element;
     this.element.classList.add('toolbar-item');
     this._visible = true;
     this._enabled = true;
     this.element.addEventListener('mouseenter', this._mouseEnter.bind(this), false);
     this.element.addEventListener('mouseleave', this._mouseLeave.bind(this), false);
   }
 
   /**
-   * @param {string} title
+   * @param {!Element|string} title
    */
   setTitle(title) {
     if (this._title === title)
       return;
     this._title = title;
     UI.Tooltip.install(this.element, title);
   }
 
   _mouseEnter() {
     this.element.classList.add('hover');
   }
 
   _mouseLeave() {
     this.element.classList.remove('hover');
   }
 
   /**
    * @param {boolean} value
    */
   setEnabled(value) {
     if (this._enabled === value)
       return;
     this._enabled = value;
-    this._applyEnabledState();
-  }
-
-  _applyEnabledState() {
-    this.element.disabled = !this._enabled || (this._toolbar && !this._toolbar._enabled);
+    this._applyEnabledState(this._enabled && (!this._toolbar || this._toolbar._enabled));
   }
 
   /**
+   * @param {boolean} enabled
+   */
+  _applyEnabledState(enabled) {
+    this.element.disabled = !enabled;
+  }
+
+  /**
    * @return {boolean} x
    */
   visible() {
     return this._visible;
   }
 
   /**
    * @param {boolean} x
    */
   setVisible(x) {
@@ skipping 406 matching lines @@
     option.text = label;
     if (title)
       option.title = title;
     if (typeof value !== 'undefined')
       option.value = value;
     return option;
   }
 
   /**
    * @override
+   * @param {boolean} enabled
    */
-  _applyEnabledState() {
-    this._selectElement.disabled = !this._enabled || (this._toolbar && !this._toolbar._enabled);
+  _applyEnabledState(enabled) {
+    super._applyEnabledState(enabled);
+    this._selectElement.disabled = !enabled;
   }
 
   /**
    * @param {!Element} option
    */
   removeOption(option) {
     this._selectElement.removeChild(option);
   }
 
   removeOptions() {
@@ skipping 66 matching lines @@
   checked() {
     return this.inputElement.checked;
   }
 
   /**
    * @param {boolean} value
    */
   setChecked(value) {
     this.inputElement.checked = value;
   }
+
+  /**
+   * @override
+   * @param {boolean} enabled
+   */
+  _applyEnabledState(enabled) {
+    super._applyEnabledState(enabled);
+    this.inputElement.disabled = !enabled;
+  }
 };