Add an option to specify requested fields for fetching metadata.

storage/browser/fileapi/file_system_url_request_job.cc

Index: storage/browser/fileapi/file_system_url_request_job.cc
diff --git a/storage/browser/fileapi/file_system_url_request_job.cc b/storage/browser/fileapi/file_system_url_request_job.cc
index 4607dd8dd6d8da0c26fbcb893517f341157cb85c..8d58f6498c14bf7db96749789b768c11f12a14f4 100644
--- a/storage/browser/fileapi/file_system_url_request_job.cc
+++ b/storage/browser/fileapi/file_system_url_request_job.cc
@@ -171,7 +171,8 @@ void FileSystemURLRequestJob::StartAsync() {
     return;
   }
   file_system_context_->operation_runner()->GetMetadata(
-      url_,
+      url_, FileSystemOperation::GET_METADATA_FIELD_IS_DIRECTORY |
+                FileSystemOperation::GET_METADATA_FIELD_SIZE,
       base::Bind(&FileSystemURLRequestJob::DidGetMetadata,
                  weak_factory_.GetWeakPtr()));
 }