Options: Fix the startup pages list.

chrome/browser/resources/options/inline_editable_list.js

 // Copyright (c) 2011 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.
 
 cr.define('options', function() {
   const DeletableItem = options.DeletableItem;
   const DeletableItemList = options.DeletableItemList;
 
   /**
    * Creates a new list item with support for inline editing.
@@ skipping 65 matching lines @@
       this.addEventListener('keydown', this.handleKeyDown_);
       this.addEventListener('leadChange', this.handleLeadChange_);
     },
 
     /** @inheritDoc */
     selectionChanged: function() {
       this.updateEditState();
     },
 
     /**
+     * Called when the input element receives focus. Selects this item in the
+     * list selection model.
+     * @private
+     */
+    handleFocus_: function() {
+      var list = this.parentNode;
+      var index = list.getIndexOfListItem(this);
+      list.selectionModel.selectedIndex = index;
+      list.selectionModel.anchorIndex = index;
+    },
+
+    /**
      * Called when this element gains or loses 'lead' status. Updates editing
      * mode accordingly.
      * @private
      */
     handleLeadChange_: function() {
       this.updateEditState();
     },
 
     /**
      * Updates the edit state based on the current selected and lead states.
@@ skipping 128 matching lines @@
         container.appendChild(textEl);
       }
 
       var inputEl = this.ownerDocument.createElement('input');
       inputEl.type = 'text';
       inputEl.value = text;
       if (!this.isPlaceholder) {
         inputEl.setAttribute('displaymode', 'edit');
         inputEl.staticVersion = textEl;
       }
+      inputEl.addEventListener('focus', this.handleFocus_.bind(this));
       container.appendChild(inputEl);
       this.editFields_.push(inputEl);
 
       return container;
     },
 
     /**
      * Resets the editable version of any controls created by createEditable*
      * to match the static text.
      * @private
@@ skipping 128 matching lines @@
       }
     },
   };
 
   // Export
   return {
     InlineEditableItem: InlineEditableItem,
     InlineEditableItemList: InlineEditableItemList,
   };
 });