DevTools: fix deepActiveElement and focus on Dialog when document blurs

third_party/WebKit/Source/devtools/front_end/settings/FrameworkBlackboxSettingsTab.js

 /*
  * Copyright 2014 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  * @implements {WebInspector.ListWidget.Delegate}
@@ skipping 10 matching lines @@
     this._disabledLabel = WebInspector.UIString("Disabled");
 
     this._list = new WebInspector.ListWidget(this);
     this._list.element.classList.add("blackbox-list");
     this._list.registerRequiredCSS("settings/frameworkBlackboxSettingsTab.css");
 
     var placeholder = createElementWithClass("div", "blackbox-list-empty");
     placeholder.textContent = WebInspector.UIString("No blackboxed patterns");
     this._list.setEmptyPlaceholder(placeholder);
     this._list.show(this.contentElement);
-    this.contentElement.appendChild(createTextButton(WebInspector.UIString("Add pattern..."), this._addButtonClicked.bind(this), "add-button"));
+    var addPatternButton = createTextButton(WebInspector.UIString("Add pattern..."), this._addButtonClicked.bind(this), "add-button");
+    this.contentElement.appendChild(addPatternButton);
 
     this._setting = WebInspector.moduleSetting("skipStackFramesPattern");
     this._setting.addChangeListener(this._settingUpdated, this);
 
+    this.setDefaultFocusedElement(addPatternButton);
     this.contentElement.tabIndex = 0;
 }
 
 WebInspector.FrameworkBlackboxSettingsTab.prototype = {
     wasShown: function()
     {
         WebInspector.SettingsTab.prototype.wasShown.call(this);
         this._settingUpdated();
     },
 
@@ skipping 126 matching lines @@
          * @return {boolean}
          */
         function behaviorValidator(item, index, input)
         {
             return true;
         }
     },
 
     __proto__: WebInspector.VBox.prototype
 }