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

storage/browser/fileapi/async_file_util_adapter.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.
 
 #include "storage/browser/fileapi/async_file_util_adapter.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 98 matching lines @@
   const size_t kResultChunkSize = 100;
 
   scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> file_enum(
       file_util->CreateFileEnumerator(context, url));
 
   base::FilePath current;
   while (!(current = file_enum->Next()).empty()) {
     DirectoryEntry entry;
     entry.is_directory = file_enum->IsDirectory();
     entry.name = VirtualPath::BaseName(current).value();
-    entry.size = file_enum->Size();
-    entry.last_modified_time = file_enum->LastModifiedTime();
     entries.push_back(entry);
 
     if (entries.size() == kResultChunkSize) {
       origin_runner->PostTask(
           FROM_HERE, base::Bind(callback, base::File::FILE_OK, entries,
                                 true /* has_more */));
       entries.clear();
     }
   }
   origin_runner->PostTask(
@@ skipping 212 matching lines @@
   GetFileInfoHelper* helper = new GetFileInfoHelper;
   const bool success = context_ptr->task_runner()->PostTaskAndReply(
       FROM_HERE,
       Bind(&GetFileInfoHelper::CreateSnapshotFile, Unretained(helper),
            sync_file_util_.get(), base::Owned(context_ptr), url),
       Bind(&GetFileInfoHelper::ReplySnapshotFile, Owned(helper), callback));
   DCHECK(success);
 }
 
 }  // namespace storage