DOMUI Prefs: Add inline buttons for setting the default search engine

chrome/browser/resources/options/search_engine_manager_engine_list.js

 // Copyright (c) 2010 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.search_engines', function() {
   const InlineEditableItemList = options.InlineEditableItemList;
   const InlineEditableItem = options.InlineEditableItem;
   const ListInlineHeaderSelectionController =
       options.ListInlineHeaderSelectionController;
 
@@ skipping 116 matching lines @@
       nameColEl.appendChild(nameEl);
 
       // Then the keyword column.
       var keywordEl = this.createEditableTextCell(keywordText,
                                                   this.isPlaceholder_);
       keywordEl.className = 'keyword-column';
       this.contentElement.appendChild(keywordEl);
 
       // And the URL column.
       var urlEl = this.createEditableTextCell(urlText, this.isPlaceholder_);
-      urlEl.className = 'url-column';
-      this.contentElement.appendChild(urlEl);
+      var urlWithButtonEl = this.ownerDocument.createElement('div');
+      urlWithButtonEl.appendChild(urlEl);
+      urlWithButtonEl.className = 'url-column';
+      this.contentElement.appendChild(urlWithButtonEl);
+      // Add the Make Default button. Temporary until drag-and-drop re-ordering
+      // is implemented. When this is removed, remove the extra div above.
+      if (engine['canBeDefault']) {
+        var makeDefaultButtonEl = this.ownerDocument.createElement('button');
+        makeDefaultButtonEl.textContent =
+            templateData.makeDefaultSearchEngineButton;
+        makeDefaultButtonEl.onclick = function(e) {
+          chrome.send('managerSetDefaultSearchEngine', [engine['modelIndex']]);
+        };
+        // Don't select the row when clicking the button.
+        makeDefaultButtonEl.onmousedown = function(e) {
+          e.stopPropagation();
+        };
+        urlWithButtonEl.appendChild(makeDefaultButtonEl);
+      }
 
       // Do final adjustment to the input fields.
       if (!engine['heading']) {
         this.nameField_ = nameEl.querySelector('input');
         this.keywordField_ = keywordEl.querySelector('input');
         this.urlField_ = urlEl.querySelector('input');
 
         if (engine['urlLocked'])
           this.urlField_.disabled = true;
 
@@ skipping 170 matching lines @@
     },
   };
 
   // Export
   return {
     SearchEngineList: SearchEngineList
   };
 
 });