[fsp] Add support for providing thumbnails.

chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.cc

 // Copyright 2014 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 "chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.h"
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 15 matching lines @@
 void GetFileInfoOnUIThread(
     scoped_ptr<storage::FileSystemOperationContext> context,
     const storage::FileSystemURL& url,
     const ProvidedFileSystemInterface::GetMetadataCallback& callback) {
   util::FileSystemURLParser parser(url);
   if (!parser.Parse()) {
     callback.Run(EntryMetadata(), base::File::FILE_ERROR_INVALID_OPERATION);
     return;
   }
 
-  parser.file_system()->GetMetadata(parser.file_path(), callback);
+  parser.file_system()->GetMetadata(
+      parser.file_path(),
+      ProvidedFileSystemInterface::METADATA_FIELD_DEFAULT,
+      callback);
 }
 
 // Routes the response of GetFileInfo back to the IO thread with a type
 // conversion.
 void OnGetFileInfo(const storage::AsyncFileUtil::GetFileInfoCallback& callback,
                    const EntryMetadata& metadata,
                    base::File::Error result) {
   base::File::Info file_info;
 
   // TODO(mtomasz): Add support for last modified time and creation time.
@@ skipping 392 matching lines @@
   NOTIMPLEMENTED();
   callback.Run(base::File::FILE_ERROR_INVALID_OPERATION,
                base::File::Info(),
                base::FilePath(),
                scoped_refptr<storage::ShareableFileReference>());
 }
 
 }  // namespace internal
 }  // namespace file_system_provider
 }  // namespace chromeos