[File Manager] Support HiDPI images in action picker and default action picker

chrome/browser/resources/file_manager/js/default_action_dialog.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.
 
 
 /**
  * DefaultActionDialog contains a message, a list box, an ok button, and a
  * cancel button.
  * This dialog should be used as action picker for file operations.
  */
@@ skipping 42 matching lines @@
     this.list_.select();
   };
 
   /**
    * Renders item for list.
    * @param {Object} item Item to render.
    */
   DefaultActionDialog.prototype.renderItem = function(item) {
     var result = this.document_.createElement('li');
 
-    var iconNode = this.document_.createElement('img');
-    iconNode.src = item.iconUrl;
-    result.appendChild(iconNode);
+    var div = this.document_.createElement('div');
+    div.textContent = item.label;
 
-    var labelNode = this.document_.createElement('span');
-    labelNode.textContent = item.label;
-    result.appendChild(labelNode);
+    if (item.iconType)
+      div.setAttribute('file-type-icon', item.iconType);
+    else
+      div.style.backgroundImage = 'url(' + item.iconUrl + ')';
+
+    result.appendChild(div);
 
     cr.defineProperty(result, 'lead', cr.PropertyKind.BOOL_ATTR);
     cr.defineProperty(result, 'selected', cr.PropertyKind.BOOL_ATTR);
 
     return result;
-  }
+  };
 
   /**
    * Shows dialog.
    *
    * @param {String} message Message in dialog caption.
    * @param {Array} items Items to render in list
    * @param {int} defaultIndex Item to select by default.
    * @param {Function} onOk Callback function.
    * @param {Function} onCancel Callback function.
    * @param {Function} onShow Callback function.
@@ skipping 42 matching lines @@
       this.onCancelClick_(event);
       event.preventDefault();
     } else if (event.keyCode == 32 || event.keyCode == 13) {
       this.onOkClick_();
       event.preventDefault();
     }
   };
 
   return {DefaultActionDialog: DefaultActionDialog};
 });