[fsp] Add support for providing thumbnails.

chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.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/file_stream_reader.h"
 
 #include "base/debug/trace_event.h"
 #include "base/files/file.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.h"
@@ skipping 102 matching lines @@
     if (!file_system_.get()) {
       BrowserThread::PostTask(
           BrowserThread::IO,
           FROM_HERE,
           base::Bind(callback, EntryMetadata(), base::File::FILE_ERROR_ABORT));
       return;
     }
 
     abort_callback_ = file_system_->GetMetadata(
         file_path_,
+        ProvidedFileSystemInterface::METADATA_FIELD_DEFAULT,
         base::Bind(&OperationRunner::OnGetMetadataCompletedOnUIThread,
                    this,
                    callback));
   }
 
   // Aborts the most recent operation (if exists), and calls the callback.
   void AbortOnUIThread(const storage::AsyncFileUtil::StatusCallback& callback) {
     DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
     if (abort_callback_.is_null()) {
@@ skipping 347 matching lines @@
     callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
     return;
   }
 
   DCHECK_EQ(base::File::FILE_OK, result);
   callback.Run(metadata.size);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos