Do not call stat() when reading directories via File API.

chrome/browser/media_galleries/win/mtp_device_delegate_impl_win.cc

 // Copyright (c) 2013 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.
 //
 // MTPDeviceDelegateImplWin implementation.
 
 #include "chrome/browser/media_galleries/win/mtp_device_delegate_impl_win.h"
 
 #include <portabledevice.h>
 
@@ skipping 185 matching lines @@
   base::FilePath current;
   scoped_ptr<MTPDeviceObjectEnumerator> file_enum =
       CreateFileEnumeratorOnBlockingPoolThread(device_info, root);
   if (!file_enum)
     return error;
 
   while (!(current = file_enum->Next()).empty()) {
     storage::DirectoryEntry entry;
     entry.is_directory = file_enum->IsDirectory();
     entry.name = storage::VirtualPath::BaseName(current).value();
-    entry.size = file_enum->Size();
-    entry.last_modified_time = file_enum->LastModifiedTime();
     entries->push_back(entry);
   }
   return error;
 }
 
 // Gets the device file stream object on a blocking pool thread.
 // |device_info| contains the device storage partition details.
 // On success, returns base::File::FILE_OK and file stream details are set in
 // |file_details|. On failure, returns a platform file error and file stream
 // details are not set in |file_details|.
@@ skipping 476 matching lines @@
         current_snapshot_details_->file_info(),
         current_snapshot_details_->request_info().snapshot_file_path);
   } else {
     current_snapshot_details_->request_info().error_callback.Run(
         base::File::FILE_ERROR_FAILED);
   }
   task_in_progress_ = false;
   current_snapshot_details_.reset();
   ProcessNextPendingRequest();
 }