Add support for favicon scale factor in WebUI

chrome/browser/resources/bookmark_manager/js/bmm/bookmark_list.js

 // Copyright (c) 2012 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.
 
 // TODO(arv): Now that this is driven by a data model, implement a data model
 //            that handles the loading and the events from the bookmark backend.
 
 cr.define('bmm', function() {
   var List = cr.ui.List;
   var ListItem = cr.ui.ListItem;
@@ skipping 371 matching lines @@
       var labelEl = this.ownerDocument.createElement('div');
       labelEl.className = 'label';
       labelEl.textContent = bookmarkNode.title;
 
       var urlEl = this.ownerDocument.createElement('div');
       urlEl.className = 'url';
 
       if (bmm.isFolder(bookmarkNode)) {
         this.className = 'folder';
       } else {
-        labelEl.style.backgroundImage = url('chrome://favicon/' +
+        labelEl.style.backgroundImage = url('chrome://favicon/size/16@' +
+                                            window.devicePixelRatio + 'x/' +
                                             bookmarkNode.url);
+        labelEl.style.backgroundSize = '16px';
         urlEl.textContent = bookmarkNode.url;
       }
 
       this.appendChild(labelEl);
       this.appendChild(urlEl);
 
       // Initially the ContextMenuButton was added here but it slowed down
       // rendering a lot so it is now added using mouseover.
     },
 
@@ skipping 162 matching lines @@
         }
       }
     }
   };
 
   return {
     BookmarkList: BookmarkList,
     list: list
   };
 });