Add an option to specify requested fields for fetching metadata.

chrome/browser/chromeos/file_manager/snapshot_manager.cc

Index: chrome/browser/chromeos/file_manager/snapshot_manager.cc
diff --git a/chrome/browser/chromeos/file_manager/snapshot_manager.cc b/chrome/browser/chromeos/file_manager/snapshot_manager.cc
index 5ebb08a98be0ed876da464b753e354743599a5fb..d069d9e72abf270e15da5d78d889e0817415d2a6 100644
--- a/chrome/browser/chromeos/file_manager/snapshot_manager.cc
+++ b/chrome/browser/chromeos/file_manager/snapshot_manager.cc
@@ -61,7 +61,7 @@ void GetMetadataOnIOThread(const base::FilePath& path,
                            const GetNecessaryFreeSpaceCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   context->operation_runner()->GetMetadata(
-      url,
+      url, storage::FileSystemOperation::GET_METADATA_FIELD_SIZE,
       base::Bind(&ComputeSpaceNeedToBeFreedAfterGetMetadata, path, callback));
 }