[DevTools]: Require explicit connection

third_party/WebKit/Source/devtools/front_end/sources/UIList.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2013 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 66 matching lines @@
    * @param {string} subtitle
    * @param {boolean=} isLabel
    */
   constructor(title, subtitle, isLabel) {
     this.element = createElementWithClass('div', 'list-item');
     if (isLabel)
       this.element.classList.add('label');
 
     this.titleElement = this.element.createChild('div', 'title');
     this.subtitleElement = this.element.createChild('div', 'subtitle');
-
+    /** @type {?Element} */
+    this._actionElement = null;
     this._hidden = false;
     this._isLabel = !!isLabel;
     this.setTitle(title);
     this.setSubtitle(subtitle);
     this.setSelected(false);
   }
 
   /**
    * @return {?WebInspector.UIList.Item}
    */
@@ skipping 94 matching lines @@
    * @return {boolean}
    */
   isLabel() {
     return this._isLabel;
   }
 
   /**
    * @param {boolean} x
    */
   setDimmed(x) {
-    this.element.classList.toggle('dimmed', x);
+    this.element.classList.toggle('dimmed-item', x);
   }
 
   discard() {
   }
 
   /**
    * @param {boolean} hoverable
    */
   setHoverable(hoverable) {
     this.element.classList.toggle('ignore-hover', !hoverable);
   }
+
+  /**
+   * @param {?string} title
+   * @param {?function(!Event):!Promise} handler
+   */
+  setAction(title, handler) {
+    if (this._actionElement)
+      this._actionElement.remove();
+    if (!title || !handler)
+      return;
+    this._actionElement = this.element.createChild('div', 'action');
+    var link = this._actionElement.createChild('a', 'action-link');
+    link.textContent = title;
+    link.addEventListener('click', (event) => {
+      link.disabled = true;
+      handler(event).then(() => link.disabled = false);
+      event.stopPropagation();
+    });
+  }
 };